17581( 1) - 30-Aug-2023 21:34:55 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17581 Version: 1 Check-in Time: 30-Aug-2023 21:34:55 STScI Edit Number: 0 Title The Last Gasp of the TDE Wind ------------------------------------------------------------------------------------ Type Cycle GO 31 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Walter Peter Maksym III NASA Marshall Space Flight Center Y CoI: Dr. Martin Elvis Smithsonian Institution Astrophysical N Observatory CoI: Dr. Giuseppina Fabbiano Smithsonian Institution Astrophysical N Observatory ------------------------------------------------------------------------------------ Abstract When a star is tidally disrupted by a supermassive black hole, the rapid accretion of the stellar debris may drive super-Eddington winds which. After a period of accretion rate decay, we expect the winds to "shut off", drastically reducing the production of broad line emission and changing the evolution of the band-specific light curve across the spectrum. Spectroscopic monitoring of new tidal disruption events (TDEs) in the ultraviolet is the best place to observe this transition due to the persistence of a windless disk continuum. the lack of stellar contamination, and the wealth of high-ionization diagnostic lines that probe the relatively small TDE accretion structure. We propose to observe 5 TDEs over 3 epochs with monitoring UV spectroscopy and complementary X-ray and optical observations, in order to observe this transition and investigate its connection to the evolution of the accretion flow. Beyond this primary goal, these observations will also provide an important legacy contribution of HST towards understanding TDE physics in the UV. ------------------------------------------------------------------------------------ Observations Description ------------------------ This program aims to spectroscopically monitor 5 tidal disruption events (TDEs) as TOOs over the course of their Eddington timescales. Like active galactic nuclei, TDEs frequently display broad spectral lines that are likely formed by emission from ionized clouds circulating in a hot accretion-driven outflowing wind. If this wind is powered by the accretion of stellar debris from the tidal disruption, then as the accretion rate declines over time (0.5-2 years), the wind should die down and the broad lines should disappear. Ancillary science depends upon measurement of the broad line strengths and kinematic profiles, and (much less challenging) the SED profile. TIME-TAG observations may be possible for a sufficiently bright TDE, which would could allow intra-observation variability studies (e.g. reverberation mapping). In terms of program strategy, this translates into monitoring each TDE over ~2 years, with a cadence of ~1 year between each of 3 epochs. We will obtain STIS FUV (G140L) and NUV (G230L) MAMA spectra using the 0.2" slit for each target in each epoch. A "typical" number of orbits is 2/2/3 for each grating in epochs #1/#2/#3, totaling 4/4/6 orbits for each epoch. 17581( 1) - 30-Aug-2023 21:34:55 - [ 2] In practice, the cadence depends upon the black hole mass (which can be estimated from pre-flare observations of the host galaxy) and the trajectory of the disrupted star (which may be imprinted in the light curve photometry). As such, each epoch #2 will be "on hold" until we have had a chance to confirm and revise the cadence strategy. *Note, 2021 July 23: As of this writing, we do not expect any target's epoch #3 to fall within Cycle 29. This would require some combination of early triggering and short Eddington timescale (e.g. a relatively massive black hole or atypically close pericenter). We have therefore not yet designed any epoch #3 visits.** *Note, 2021 July 23: Due to server errors for the Very Bright TDE epoch #2 setups, as a workaround we have turned off auto-wavecals and re-added them manually** Since neither the brightness nor the light cuve evolution is known, we have devised sample visit strategies for multiple different combinatons of the two: We assign a different cadence to each target, with plausible example timescales between 0.41 years and 1.25 years. For each target we devise two different alternate setups, each covering epochs #1 and #2: 1) The first setup assumes a very bright target which requires a neutral density filter for acquisition, and therefore a longer acquisition time. For a very bright target, TIME-TAG observations may be possible, and fewer orbits may be efficiently used in epoch #1 (only one orbit per grating, possibly allowing additional targets or improved late-time epochs). 2) The second setup assumes a moderately bright target (fainter, but still bright enough for UV spectroscopy) and uses the 50CCD filter with a reduced acquisition exposure. The second setup does not use TIME-TAG observations and assumes 2 orbits per grating in epoch #1 and epoch #2. We will refine these setups before triggering epoch #1. Epoch #2 is on hold to refine the setup (including cadence) after triggering epoch #1. In any case, these are long baseline observations: the cadence is unlikely to be Additional Comments: This observation assumes the TDE is sufficiently faint that a CCD50 filter is appropriate for acquisition, and that TIME-TAG mode will be beneficial "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" will be estimated from archival photometry of the host galaxy (or more reliable archival/published results as available) and consequent estimates of the associated black hole mass when epoch #1 is triggered, so the timing requirements may need to be refined. Depending upon the target, it may also be possible to expand the window if visibility becomes an issue. Buffer times may also need to be increased. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 NAME-AT-202 STIS/CCD ACQ F25ND3 MIRROR DIFFUSE-CENTER=FLUX-CENTROID, 1 20 S (20 1EHB ACQTYPE=DIFFUSE, CHECKBOX=25 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 NAME-AT-202 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=685, WAVECAL=NO 1 1300 S 1EHB -MAMA G see below (2144 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 NAME-AT-202 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=685 1 2500 S 1EHB -MAMA G see below (2818 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 6 NAME-AT-202 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=1000 1 2500 S 1EHB -MAMA G see below (2677 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WAVE STIS/FUV ACCUM 52X0.2 G140L 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 8 NAME-AT-202 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=1000 1 2500 S 1EHB -MAMA G see below (2818 S) ------------------------------------------------------------------------------------------------------------------------------------ 9 WAVE STIS/FUV ACCUM 52X0.2 G140L 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 17581( 1) - 30-Aug-2023 21:34:55 - [ 25] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ NAME-AT-2021EHB 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A NAME-AT-2021EHB 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 2144.0 S -MAMA G WAVE 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA NAME-AT-2021EHB 4 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 2818.0 S -MAMA G WAVE 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA NAME-AT-2021EHB 6 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 2677.0 S -MAMA G WAVE 7 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 N/A -MAMA NAME-AT-2021EHB 8 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 4 2818.0 S -MAMA G WAVE 9 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 N/A -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 26] Visit: 11 (Moderately bright TDE epoch #1 setup - 0.41 yr cadence) Visit Requirements: ON HOLD ; TOO RESPONSE TIME 50.0D On Hold Comments: Target of opportunity. Conditional on TOO properties as follow if target is less bright. This setup will be triggered for a less-bright TDE which does not warrant a strong acquisition filter or TIME-TAG mode. Choice of target is somewhat flexible - we expect a bright (absolute V<-18) transient consistent with a galactic nucleus at z<0.2, which may be refined by optical spectroscopy (notable TDE characteristics include broad Balmer, He II or Bowen lines) or X-rays (e.g. supersoft quasi-blackbody spectrum), but there is enough variety in possible distinctive characteristics that a narrow definition is not practical. We expect to confirm UV brightness and MAMA safety via Swift or other UV instruments (eg XMM if necessary). Acquisition time may need to be modified. Additional Comments: This observation assumes the TDE is NOT bright enough for a strong filter or TIME-TAG mode. Since this has 0.41 year cadence, it is followed by visit (12) for epoch #2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-3 STIS/CCD ACQ 50CCD MIRROR ACQTYPE=DIFFUSE, 1 15 S (15 CHECKBOX=13.0, S) DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-3 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1300 S -MAMA see below (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TDE-TOO-3 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-3 STIS/FUV ACCUM 52X0.2 G140L 1425 1 1300 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TDE-TOO-3 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-3 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A 17581( 1) - 30-Aug-2023 21:34:55 - [ 27] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-3 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2165.0 S -MAMA TDE-TOO-3 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2722.0 S -MAMA TDE-TOO-3 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 2722.0 S -MAMA TDE-TOO-3 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 28] Visit: 12 (Moderately bright TDE epoch #2 setup - 0.41 yr cadence) Visit Requirements: AFTER 11 BY 131 D TO 168 D; ON HOLD On Hold Comments: Conditional on confirmation that the timing requirements are appropriate for the observed host galaxy properties or light curve decay rate. Acquisition time and timing requirements may need to be revised. Additional Comments: This observation assumes the TDE is NOT sufficiently bright for a strong filter or TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" will be estimated from archival photometry of the host galaxy (or more reliable archival/published results as available) and consequent estimates of the associated black hole mass when epoch #1 is triggered, so the timing requirements may need to be refined. Depending upon the target, it may also be possible to expand the window if visibility becomes an issue. Buffer times may also need to be increased. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-3 STIS/CCD ACQ 50CCD MIRROR ACQTYPE=DIFFUSE, 1 15 S (15 CHECKBOX=13.0, S) DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-3 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1300 S -MAMA see below (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TDE-TOO-3 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-3 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TDE-TOO-3 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-3 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A TDE-TOO-3 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2165.0 S -MAMA TDE-TOO-3 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 29] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-3 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 2722.0 S -MAMA TDE-TOO-3 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 30] Visit: 13 (AT2022dsb epoch #1 setup - 0.26 yr cadence) Visit Requirements: ON HOLD ; TOO RESPONSE TIME 24.0D On Hold Comments: AT2022dsb (https://www.wis-tns.org/object/2022dsb) is ideal for this program. It has an optical (ASAS-SN) trigger, nuclear location, TDE emission lines, and eROSITA detection. From V-band bulge photometry and H-alpha width, we estimate the black hole mass to be ~3e7 solar masses, so we expect the Eddington timescale to be ~180 days, so we will sample UV spectroscopy 3x over that period. Our primary constraint is orbital visibility, which is close to the timescale we are interested in. Additional Comments: This visit will use TIME-TAG mode. It is followed by visit (14) for epoch #2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022DSB STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022DSB STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=670 1 1300 S -MAMA G see below (2160 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022DSB STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=670 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022DSB STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 AT2022DSB STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022DSB 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022DSB 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 2160.0 S -MAMA G AT2022DSB 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 2737.0 S -MAMA G AT2022DSB 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 2737.0 S -MAMA G AT2022DSB 5 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 4 2737.0 S -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 31] Visit: 14 (AT2022dsb epoch #2 setup - 0.26 yr cadence) Visit Requirements: AFTER 13 BY 70 D TO 100 D; ON HOLD FOR 13 On Hold Comments: Epoch #2 in a sequence triggered by TOO (13) AT2022dsb Additional Comments: This visit will use TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" (Lodato & Rossi 2011). Based on Pan-STARRS imaging of the host galaxy ESO 583-4 and the H-alpha width, we estimate this to be ~190 days, over which we would observe the target 3 times. We may need to be flexible here due to limited observing windows. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022DSB STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022DSB STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=670 1 1300 S -MAMA G see below (2160 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022DSB STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=670 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022DSB STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 AT2022DSB STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022DSB 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022DSB 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 2160.0 S -MAMA G AT2022DSB 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 2737.0 S -MAMA G AT2022DSB 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 2737.0 S -MAMA G AT2022DSB 5 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 4 2737.0 S -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 32] Visit: 15 (AT2022dsb epoch #3-NUV setup - 0.26 yr cadence) Visit Requirements: AFTER 14 BY 70 D TO 100 D; GROUP 15, 16 WITHIN 5D; ON HOLD FOR 14 On Hold Comments: NUV portion of epoch #3 in a sequence triggered by TOO (13) AT2022dsb Additional Comments: This visit will use TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" (Lodato & Rossi 2011). Based on Pan-STARRS imaging of the host galaxy ESO 583-4 and the H-alpha width, we estimate this to be ~190 days, over which we would observe the target 3 times. We may need to be flexible here due to limited observing windows. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022DSB STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022DSB STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=670 1 1300 S -MAMA G see below (2160 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022DSB STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=670 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022DSB STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=670 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022DSB 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022DSB 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 2160.0 S -MAMA G AT2022DSB 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 2737.0 S -MAMA G AT2022DSB 4 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 3 2737.0 S -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 33] Visit: 16 (AT2022dsb epoch #3-FUV setup - 0.26 yr cadence) Visit Requirements: AFTER 14 BY 70 D TO 100 D; ON HOLD FOR 14 On Hold Comments: FUV portion of epoch #3 in a sequence triggered by TOO (13) AT2022dsb Additional Comments: This visit will use TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" (Lodato & Rossi 2011). Based on Pan-STARRS imaging of the host galaxy ESO 583-4 and the H-alpha width, we estimate this to be ~190 days, over which we would observe the target 3 times. We may need to be flexible here due to limited observing windows. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022DSB STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 15 S (15 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022DSB STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1300 S -MAMA G see below (2160 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022DSB STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 1300 S -MAMA G see below (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022DSB STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=2000 1 2737 S -MAMA G (2737 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022DSB 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022DSB 2 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 1 2160.0 S -MAMA G AT2022DSB 3 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 2 2737.0 S -MAMA G AT2022DSB 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 N/A -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 34] Visit: 17 (Very bright TDE epoch #1 setup - 0.79 yr cadence) Visit Requirements: ON HOLD ; TOO RESPONSE TIME 50.0D On Hold Comments: Target of opportunity. Conditional on TOO properties as follow if target is very bright. This setup will be triggered for a TDE which is bright enough to require a neutral density filter for acquisiton, and that TIME-TAG mode will be beneficial. In such a case, one orbit per grating may be sufficient for Epoch #1. Choice of target is somewhat flexible - we expect a bright (absolute V<-18) transient consistent with a galactic nucleus at z<0.2, which may be refined by optical spectroscopy (notable TDE characteristics include broad Balmer, He II or Bowen lines) or X-rays (e.g. supersoft quasi-blackbody spectrum), but there is enough variety in possible distinctive characteristics that a narrow definition is not practical. We expect to confirm UV brightness and MAMA safety via Swift or other UV instruments (eg XMM if necessary). The buffer times may also need to be increased. Additional Comments: This observation assumes the TDE is sufficiently bright that a neutral density filter is necessary for acquisition, and that TIME-TAG mode will be beneficial Since this has 0.79 year cadence, it is followed by visit (18) for epoch #2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-5 STIS/CCD ACQ F25ND3 MIRROR ACQTYPE=DIFFUSE, 1 180 S (180 CHECKBOX=13.0, S) DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-5 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=148, WAVECAL=NO 1 1300 S -MAMA G see below (1502 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-5 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=141 1 1300 S -MAMA G see below (2581 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/FUV ACCUM 52X0.2 G140L 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-5 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A 17581( 1) - 30-Aug-2023 21:34:55 - [ 35] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-5 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1502.0 S -MAMA G WAVE 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA TDE-TOO-5 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 2 2581.0 S -MAMA G WAVE 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 2 N/A -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 36] Visit: 18 (Very bright TDE epoch #2 setup - 0.79 yr cadence) Visit Requirements: AFTER 17 BY 252 D TO 354 D; ON HOLD On Hold Comments: Conditional on confirmation that the timing requirements are appropriate for the observed host galaxy properties or light curve decay rate. Timing requirements may need to be revised. Buffer times may need to be increased. Additional Comments: This observation assumes the TDE is sufficiently bright that a neutral density filter is necessary for acquisition, and that TIME-TAG mode will be beneficial. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" will be estimated from archival photometry of the host galaxy (or more reliable archival/published results as available) and consequent estimates of the associated black hole mass when epoch #1 is triggered, so the timing requirements may need to be refined. Depending upon the target, it may also be possible to expand the window if visibility becomes an issue. Buffer times may also need to be increased. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-5 STIS/CCD ACQ F25ND3 MIRROR DIFFUSE-CENTER=FLUX-CENTROID, 1 180 S (180 ACQTYPE=DIFFUSE, CHECKBOX=13 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-5 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=148, WAVECAL=NO 1 1300 S -MAMA G see below (1502 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-5 STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=148 1 2500 S -MAMA G see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 WAVE STIS/NUV ACCUM 52X0.2 G230L 2376 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 6 TDE-TOO-5 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=141 1 2500 S -MAMA G see below (2581 S) ------------------------------------------------------------------------------------------------------------------------------------ 7 WAVE STIS/FUV ACCUM 52X0.2 G140L 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ 8 TDE-TOO-5 STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=141 1 2500 S -MAMA G see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 17581( 1) - 30-Aug-2023 21:34:55 - [ 37] Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 9 WAVE STIS/FUV ACCUM 52X0.2 G140L 1425 1 DEF (0 S) -MAMA ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-5 1 STIS/CCD ACQ F25ND3 MIRROR none none none none 1 N/A TDE-TOO-5 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 1502.0 S -MAMA G WAVE 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 N/A -MAMA TDE-TOO-5 4 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 2722.0 S -MAMA G WAVE 5 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 N/A -MAMA TDE-TOO-5 6 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 2581.0 S -MAMA G WAVE 7 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 N/A -MAMA TDE-TOO-5 8 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 4 2722.0 S -MAMA G WAVE 9 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 N/A -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 38] Visit: 19 (Moderately bright TDE epoch #1 setup - 0.79 yr cadence) Visit Requirements: ON HOLD ; TOO RESPONSE TIME 50.0D On Hold Comments: Target of opportunity. Conditional on TOO properties as follow if target is less bright. This setup will be triggered for a less-bright TDE which does not warrant a strong acquisition filter or TIME-TAG mode. Choice of target is somewhat flexible - we expect a bright (absolute V<-18) transient consistent with a galactic nucleus at z<0.2, which may be refined by optical spectroscopy (notable TDE characteristics include broad Balmer, He II or Bowen lines) or X-rays (e.g. supersoft quasi-blackbody spectrum), but there is enough variety in possible distinctive characteristics that a narrow definition is not practical. We expect to confirm UV brightness and MAMA safety via Swift or other UV instruments (eg XMM if necessary). Acquisition time may need to be modified. Additional Comments: This observation assumes the TDE is NOT bright enough for a strong filter or TIME-TAG mode. Since this has 0.55 year cadence, it is followed by visit (20) for epoch #2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-5 STIS/CCD ACQ 50CCD MIRROR ACQTYPE=DIFFUSE, 1 15 S (15 CHECKBOX=13.0, S) DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-5 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1300 S -MAMA see below (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TDE-TOO-5 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-5 STIS/FUV ACCUM 52X0.2 G140L 1425 1 1300 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TDE-TOO-5 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-5 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A 17581( 1) - 30-Aug-2023 21:34:55 - [ 39] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-5 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2165.0 S -MAMA TDE-TOO-5 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2722.0 S -MAMA TDE-TOO-5 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 2722.0 S -MAMA TDE-TOO-5 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 40] Visit: 20 (Moderately bright TDE epoch #2 setup - 0.79 yr cadence) Visit Requirements: AFTER 19 BY 252 D TO 354 D; ON HOLD On Hold Comments: Conditional on confirmation that the timing requirements are appropriate for the observed host galaxy properties or light curve decay rate. Acquisition time and timing requirements may need to be revised. Additional Comments: This observation assumes the TDE is NOT sufficiently bright for a strong filter or TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" will be estimated from archival photometry of the host galaxy (or more reliable archival/published results as available) and consequent estimates of the associated black hole mass when epoch #1 is triggered, so the timing requirements may need to be refined. Depending upon the target, it may also be possible to expand the window if visibility becomes an issue. Buffer times may also need to be increased. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-5 STIS/CCD ACQ 50CCD MIRROR ACQTYPE=DIFFUSE, 1 15 S (15 CHECKBOX=13.0, S) DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-5 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1300 S -MAMA see below (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TDE-TOO-5 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-5 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TDE-TOO-5 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-5 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A TDE-TOO-5 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2165.0 S -MAMA TDE-TOO-5 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 41] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-5 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 2722.0 S -MAMA TDE-TOO-5 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 42] Visit: 21 (Moderately bright TDE epoch #1 setup - 0.55 yr cadence) Visit Requirements: ON HOLD ; TOO RESPONSE TIME 50.0D On Hold Comments: Target of opportunity. Conditional on TOO properties as follow if target is less bright. This setup will be triggered for a less-bright TDE which does not warrant a strong acquisition filter or TIME-TAG mode. Choice of target is somewhat flexible - we expect a bright (absolute V<-18) transient consistent with a galactic nucleus at z<0.2, which may be refined by optical spectroscopy (notable TDE characteristics include broad Balmer, He II or Bowen lines) or X-rays (e.g. supersoft quasi-blackbody spectrum), but there is enough variety in possible distinctive characteristics that a narrow definition is not practical. We expect to confirm UV brightness and MAMA safety via Swift or other UV instruments (eg XMM if necessary). Acquisition time may need to be modified. Additional Comments: This observation assumes the TDE is NOT bright enough for a strong filter or TIME-TAG mode. Since this has 0.55 year cadence, it is followed by visit (16) for epoch #2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-4 STIS/CCD ACQ 50CCD MIRROR ACQTYPE=DIFFUSE, 1 15 S (15 CHECKBOX=13.0, S) DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-4 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1300 S -MAMA see below (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TDE-TOO-4 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-4 STIS/FUV ACCUM 52X0.2 G140L 1425 1 1300 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TDE-TOO-4 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-4 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A 17581( 1) - 30-Aug-2023 21:34:55 - [ 43] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-4 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2165.0 S -MAMA TDE-TOO-4 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2722.0 S -MAMA TDE-TOO-4 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 2722.0 S -MAMA TDE-TOO-4 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 44] Visit: 22 (Moderately bright TDE epoch #2 setup - 0.55 yr cadence) Visit Requirements: AFTER 21 BY 176 D TO 226 D; ON HOLD On Hold Comments: Conditional on confirmation that the timing requirements are appropriate for the observed host galaxy properties or light curve decay rate. Acquisition time and timing requirements may need to be revised. Additional Comments: This observation assumes the TDE is NOT sufficiently bright for a strong filter or TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" will be estimated from archival photometry of the host galaxy (or more reliable archival/published results as available) and consequent estimates of the associated black hole mass when epoch #1 is triggered, so the timing requirements may need to be refined. Depending upon the target, it may also be possible to expand the window if visibility becomes an issue. Buffer times may also need to be increased. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE-TOO-4 STIS/CCD ACQ 50CCD MIRROR ACQTYPE=DIFFUSE, 1 15 S (15 CHECKBOX=13.0, S) DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE-TOO-4 STIS/NUV ACCUM 52X0.2 G230L 2376 1 1300 S -MAMA see below (2165 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 TDE-TOO-4 STIS/NUV ACCUM 52X0.2 G230L 2376 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 TDE-TOO-4 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 TDE-TOO-4 STIS/FUV ACCUM 52X0.2 G140L 1425 1 2500 S -MAMA see below (2722 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-4 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A TDE-TOO-4 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2165.0 S -MAMA TDE-TOO-4 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 45] Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ TDE-TOO-4 4 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 3 2722.0 S -MAMA TDE-TOO-4 5 STIS/FUV ACCUM 52X0.2 G140L 1425 none none none none 4 2722.0 S -MAMA 17581( 1) - 30-Aug-2023 21:34:55 - [ 46] Visit: 23 (AT2022hvp epoch #1 setup - 0.41 yr cadence) Visit Requirements: ON HOLD ; TOO RESPONSE TIME 18.0D On Hold Comments: AT2022hvp (https://www.wis-tns.org/object/2022dsb) is ideal for this program. It has an optical (ZTF) trigger, nuclear location, probable TDE emission lines, and Swift UV detection. From the SED we estimate the black hole mass to be 13e7 solar masses, so we expect the Eddington timescale to be ~302 days, so we will sample UV spectroscopy 3x over that period. Our primary constraint is orbital visibility, which is close to the timescale we are interested in. Additional Comments: This visit will use TIME-TAG mode. It is followed by visit (24) for epoch #2 Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022HVP STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 10 S (10 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022HVP STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=821 1 2412 S -MAMA G (2412 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022HVP STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=821 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022HVP STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=6000 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 AT2022HVP STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=6000 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022HVP 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022HVP 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 N/A -MAMA G AT2022HVP 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 N/A -MAMA G AT2022HVP 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 N/A -MAMA G AT2022HVP 5 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 4 N/A -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 47] Visit: 24 (AT2022hvp epoch #2 setup - 0.41 yr cadence) Visit Requirements: AFTER 23 BY 137 D TO 174 D; ON HOLD FOR 23 On Hold Comments: Epoch #2 in a sequence triggered by TOO (23) AT2022hvp Additional Comments: This visit will use TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" (Lodato & Rossi 2011). Based on the SED we would estimate this to be ~302 days, over which we would observe the target 3 times. We may need to be flexible here due to limited observing windows. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022HVP STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 100 S (100 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022HVP STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=821 1 2052 S -MAMA G (2052 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022HVP STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=821 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022HVP STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=6000 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ 5 AT2022HVP STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=6000 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022HVP 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022HVP 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 N/A -MAMA G AT2022HVP 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 N/A -MAMA G AT2022HVP 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 N/A -MAMA G AT2022HVP 5 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 4 N/A -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 48] Visit: 25 (AT2022hvp epoch #3 NUV setup - 0.41 yr cadence) Visit Requirements: AFTER 24 BY 100 D TO 200 D; GROUP 25, 26 WITHIN 5D; ON HOLD FOR 24 On Hold Comments: Epoch 3 in a sequence triggered by TOO (23) AT2022hvp Additional Comments: This visit will use TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" (Lodato & Rossi 2011). Based on the SED we would estimate this to be ~302 days, over which we would observe the target 3 times. We may need to be flexible here due to limited observing windows. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022HVP STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 10 S (10 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022HVP STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=821 1 2412 S -MAMA G (2412 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022HVP STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=821 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022HVP STIS/NUV TIME-TA 52X0.2 G230L 2376 BUFFER-TIME=821 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022HVP 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022HVP 2 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 1 N/A -MAMA G AT2022HVP 3 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 2 N/A -MAMA G AT2022HVP 4 STIS/NUV TIME-TA 52X0.2 G230L 2376 none none none none 3 N/A -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 49] Visit: 26 (AT2022hvp epoch #3 FUV setup - 0.41 yr cadence) Visit Requirements: AFTER 24 BY 100 D TO 200 D; GROUP 26, 25 WITHIN 5D; ON HOLD FOR 24 On Hold Comments: Epoch 3 in a sequence triggered by TOO (23) AT2022hvp Additional Comments: This visit will use TIME-TAG mode. "Typical" TDEs for this program can expect epoch #2 after ~1 year and epoch #3 after ~2 years. The relevant "Eddington timescale" (Lodato & Rossi 2011). Based on the SED we would estimate this to be ~302 days, over which we would observe the target 3 times. We may need to be flexible here due to limited observing windows. Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| (Total) | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 AT2022HVP STIS/CCD ACQ 50CCD MIRROR ACQTYPE=POINT 1 10 S (10 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2022HVP STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=6000 1 2412 S -MAMA G (2412 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2022HVP STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=6000 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2022HVP STIS/FUV TIME-TA 52X0.2 G140L 1425 BUFFER-TIME=6000 1 2969 S -MAMA G (2969 S) ------------------------------------------------------------------------------------------------------------------------------------ Sub Exposures ------------------------------------------------------------------------------------------------------------------------------------ Target | Exp |Instr | Oper. | Aper |Spectral|Cent.|Primary |Secondary |Iteration |CR-SPLIT |Orbit |Duration Name | Num |Config | Mode | or FOV |Element |Wave.|Pattern Pos |Pattern Pos |Num |Num |Number | ------------------------------------------------------------------------------------------------------------------------------------ AT2022HVP 1 STIS/CCD ACQ 50CCD MIRROR none none none none 1 N/A AT2022HVP 2 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 1 N/A -MAMA G AT2022HVP 3 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 2 N/A -MAMA G AT2022HVP 4 STIS/FUV TIME-TA 52X0.2 G140L 1425 none none none none 3 N/A -MAMA G 17581( 1) - 30-Aug-2023 21:34:55 - [ 50] Summary Form for Proposal 17581 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 50CCD, 52X0.2, F25ND3 ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ, TIME-TAG ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=DIFFUSE, ACQTYPE=POINT, BUFFER-TIME=1000, BUFFER-TIME=141, BUFFER-TIME=148, BUFFER-TIME=200, BUFFER-TIME=2000, BUFFER-TIME=6000, BUFFER-TIME=670, BUFFER-TIME=685, BUFFER-TIME=821, CHECKBOX=13, CHECKBOX=13.0, CHECKBOX=25, DIFFUSE-CENTER=FLUX-CENTROID, WAVECAL=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 320 D TO 410 D, AFTER 03 BY 320 D TO 410 D, AFTER 05 BY 399 D TO 513 D, AFTER 07 BY 399 D TO 513 D, AFTER 09 BY 137 D TO 165 D, AFTER 11 BY 131 D TO 168 D, AFTER 13 BY 70 D TO 100 D, AFTER 14 BY 70 D TO 100 D, AFTER 17 BY 252 D TO 354 D, AFTER 19 BY 252 D TO 354 D, AFTER 21 BY 176 D TO 226 D, AFTER 23 BY 137 D TO 174 D, AFTER 24 BY 100 D TO 200 D, GROUP 15, 16 WITHIN 5D, GROUP 25, 26 WITHIN 5D, GROUP 26, 25 WITHIN 5D, ON HOLD , ON HOLD FOR 13, ON HOLD FOR 14, ON HOLD FOR 23, ON HOLD FOR 24, TOO RESPONSE TIME 18.0D, TOO RESPONSE TIME 24.0D, TOO RESPONSE TIME 50.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names AT2022DSB, AT2022HVP, NAME-AT-2021EHB, TDE-TOO-1, TDE-TOO-2, TDE-TOO-3, TDE-TOO-4, TDE-TOO-5, WAVE ------------------------------------------------------------------------------------------------------------------------------------