0Assigned ID: 1493
----- Attempting Submission 1 (Tue Apr 06 03:27:22 GMT 2021) -----Updating 16775 to increase acquisition time for visit 24-1985984661----- Attempting Submission 1 (Sun Jul 25 16:13:08 GMT 2021) -----
HST Phase II Proposal 16775 successfully submitted.
Receipt: # 16775-1
----- Attempting Submission 2 (Mon Jul 26 13:03:09 GMT 2021) -----
----- Attempting Submission 3 (Mon Feb 14 23:01:22 GMT 2022) -----
----- Attempting Submission 4 (Wed Feb 16 22:25:16 GMT 2022) -----
----- Attempting Submission 5 (Fri Feb 18 21:39:54 GMT 2022) -----
----- Attempting Submission 6 (Wed Apr 06 00:05:34 GMT 2022) -----
----- Attempting Submission 7 (Fri Apr 08 16:39:45 GMT 2022) -----
HST Phase II Proposal 16775 successfully submitted.
Receipt: # 16775-7
----- Attempting Submission 8 (Fri Apr 08 17:05:23 GMT 2022) -----
----- Attempting Submission 9 (Wed May 18 03:45:19 GMT 2022) -----
----- Attempting Submission 10 (Tue Jul 12 21:54:47 GMT 2022) -----
----- Attempting Submission 11 (Thu Oct 27 21:15:51 GMT 2022) -----The Last Gasp of the TDE WindWhen 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.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.
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 <months in any event.PI Maksym is an acknowledged expert on tidal disruption events, and has worked on tidal disruption events (TDEs) since his PhD thesis, which was a serendipitous survey for TDEs using archival X-ray observations of galaxy clusters. He has published multiple papers on TDEs both as first author and supporting author. Dr. Maksym has been working with X-ray data for ~21 years and is therefore exceptionally well-qualified to work with the XMM-Newton data. He has also worked extensively with longer wavelength data including optical spectroscopy, and is currently leading the long-term ultraviolet spectroscopic follow-up of ASASSN-14li (described in this proposal), having contributed to the first UV spectroscopy paper on TDEs (Cenko et al, 2016).
Dr. Maksym intends to use public survey notices and to identify TDEs for follow-up, and intends work with the discovering team(s) to ensure optimal follow-up strategy that takes advantage of data at other wavelengths. He intends to include members of any discovering team in the publications resulting from this program's data.
Co-I Elvis is a recognized expert in quasar physics, having led and contributed to broad-ranging studies that have contributed to our current understanding of supermassive black hole accretion the physics of the BLR. His expertise will contribute to our interpretation of the spectra.
Co-I Fabbiano is a recognized expert in X-ray astronomy, and actively engaged in studies of AGN. Her expertise will be important to the scientific interpretation of the data, and to the analysis of the XMM X-ray spectra.
Drs. Maksym, Elvis and Fabbiano have institutional CfA access to service observing via the 6.5 meter telescopes at MMT (Arizona, northern, 137 nights/year total) and twin Magellan telescopes (Chile, southern, ~119 telescope-nights/year total). Each of these observatories can easily obtain useful optical spectra for the intended targets in ~30 minutes. Magellan is typically requested 1:1, and occasionally undersubscribed with additional calls for new CfA proposals. MMT is modestly, oversubscribed ~2:1. The time allocation committee for these telescopes prioritizes early career researchers (e.g. Dr. Maksym, who only recently ceased being a postdoc) and new/unusual programs. Support of a 70-orbit time-sensitive HST program would certainly qualify as both new/unusual and scientifically high priority.
PI Maksym has experience requesting and using public US Gemini time for TDE spectroscopic programs, including fast turnaround time. Gemini's queue observing and fast turnaround time are particularly well-suited for transient follow-up, although this program's timescales are long enough to fit within a regular proposal call.Supermassive Black Holes and Active Galaxies6falsefalsetruefalsefalsefalsefalse97.5trueSUPPORTEDGALAXYNUCLEUSThis object was generated by the targetselector and retrieved from the SIMBAD database.J2000GALAXYACCRETION DISKNUCLEUSWINDDiscovery report is 15:42:21.743 -22:40:14.04 (same as host galaxy ESO 583-4, which is very extended, so should be coincident with the nucleus). We use RA, DEC from Swift (~0.2 arcsec offset).
V-magnitude is from most recent Swift measurementsJ2000GALAXYACCRETION DISKNUCLEUSWINDTransient in decay, believed to be a TDE. V is converted from ZTF/LASAIR g-band 59715.2J2000GALAXYACCRETION DISKBLRNUCLEUSWINDBright optical/UV flare consistent with the location of a galactic nucleus (and consistent with common TDE photometric or spectroscopic signatures such as broad lines from Balmer, He II or Bowen transitions, or supersoft X-ray spectrum). We will confirm useful UV brightness e.g. via Swift. Primary selection may be from ATels or follow-up of optical or X-ray surveys.UV-bright Tidal Disruption EventGALAXYACCRETION DISKBLRNUCLEUSWINDBright optical/UV flare consistent with the location of a galactic nucleus (and consistent with common TDE photometric or spectroscopic signatures such as broad lines from Balmer, He II or Bowen transitions, or supersoft X-ray spectrum). We will confirm useful UV brightness e.g. via Swift. Primary selection may be from ATels or follow-up of optical or X-ray surveys.UV-bright Tidal Disruption EventBright optical/UV flare consistent with the location of a galactic nucleus (and consistent with common TDE photometric or spectroscopic signatures such as broad lines from Balmer, He II or Bowen transitions, or supersoft X-ray spectrum). We will confirm useful UV brightness e.g. via Swift. Primary selection may be from ATels or follow-up of optical or X-ray surveys.UV-bright Tidal Disruption EventBright optical/UV flare consistent with the location of a galactic nucleus (and consistent with common TDE photometric or spectroscopic signatures such as broad lines from Balmer, He II or Bowen transitions, or supersoft X-ray spectrum). We will confirm useful UV brightness e.g. via Swift. Primary selection may be from ATels or follow-up of optical or X-ray surveys.UV-bright Tidal Disruption EventBright optical/UV flare consistent with the location of a galactic nucleus (and consistent with common TDE photometric or spectroscopic signatures such as broad lines from Balmer, He II or Bowen transitions, or supersoft X-ray spectrum). We will confirm useful UV brightness e.g. via Swift. Primary selection may be from ATels or follow-up of optical or X-ray surveys.UV-bright Tidal Disruption EventSTIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376STIS/FUV-MAMASpectroscopicNoNoG140L1425STIS/NUV-MAMASpectroscopicNoNoG230L2376Timing link suitability includes constraints ([02 After 01 by 320.0 to 410.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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 1 year cadence, it is followed by visit (02) for epoch #2(Tic-Visit
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Conditional on TOO properties as follow if target is very bright.
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The buffer times may also need to be increased.Timing link suitability includes constraints ([02 After 01 by 320.0 to 410.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
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Buffer times may need to be increased.Timing link suitability includes constraints ([04 After 03 by 320.0 to 410.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.This observation assumes the TDE is NOT bright enough for a strong filter or TIME-TAG mode.
Since this has 1 year cadence, it is followed by visit (04) for epoch #2(Tic-Visit
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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.Timing link suitability includes constraints ([04 After 03 by 320.0 to 410.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
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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.Timing link suitability includes constraints ([06 After 05 by 399.0 to 513.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
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:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "06"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "06"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Conditional 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.Timing link suitability includes constraints ([08 After 07 by 399.0 to 513.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.This observation assumes the TDE is NOT bright enough for a strong filter or TIME-TAG mode.
Since this has 1.25 year cadence, it is followed by visit (08) for epoch #2(Tic-Visit
:proposal-id 16775
:visit-id "07"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:15.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "07"
:obset-id "07"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "07"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "07"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "07"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "07"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Target 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.Timing link suitability includes constraints ([08 After 07 by 399.0 to 513.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "08"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:17.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "08"
:obset-id "08"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "08"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "08"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "08"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "08"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Conditional 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.Timing link suitability includes constraints ([10 After 09 by 137.0 to 165.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.This observation assumes the TDE is sufficiently faint that a CCD50 filter is appropriate for acquisition, and that TIME-TAG mode will be beneficial
Since this has 0.41 year cadence, it is followed by visit (10) for epoch #2(Tic-Visit
:proposal-id 16775
:visit-id "09"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:18.0"
:trans-errors '(:WARNINGS 3 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 1844560
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "09"
:obset-id "09"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "09"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2845
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3238
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "09"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2846
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3238
:pcs-gap 0
)true20Target 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.Extinction E(B-V) for this target was determined at its coordinates using https://irsa.ipac.caltech.edu/applications/DUST/
Redshift z=0.017 was determined from Simbad and the transient name server: https://www.wis-tns.org/object/2021ehb
The spectral normalization determined via private communication from the team studying this transient with Swift. They reported UVW2~19 mag for the Swift UVOT via private communication. We used standard Swift photometric conversions to obtain F_UVW2~4.5e-16 cgs. We selected 1900 AA since UVW2 throughput peaks at ~1900 AA. The UVW2 filter has a red tail, but like quasars TDEs tend to have blue SEDs, so this is a reasonable approximation.Timing link suitability includes constraints ([10 After 09 by 137.0 to 165.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "10"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:19.0"
:trans-errors '(:WARNINGS 5 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 1113888
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "10"
:obset-id "10"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "10"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2845
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3238
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "10"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2846
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3238
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "10"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2846
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3238
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "10"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2846
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3238
:pcs-gap 0
)true40Timing link suitability includes constraints ([12 After 11 by 131.0 to 168.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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(Tic-Visit
:proposal-id 16775
:visit-id "11"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:20.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "11"
:obset-id "11"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "11"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "11"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "11"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "11"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Target 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.Timing link suitability includes constraints ([12 After 11 by 131.0 to 168.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "12"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:21.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "12"
:obset-id "12"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "12"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "12"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "12"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "12"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Conditional 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.Timing link suitability includes constraints ([14 After 13 by 70.0 to 100.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.This visit will use TIME-TAG mode.
It is followed by visit (14) for epoch #2(Tic-Visit
:proposal-id 16775
:visit-id "13"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:22.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 991920
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "13"
:obset-id "13"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "13"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2764
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "13"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 2258
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "13"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "13"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)true40AT2022dsb (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.Timing link suitability includes constraints ([14 After 13 by 70.0 to 100.0 days] [15 After 14 by 70.0 to 100.0 days] [16 After 14 by 70.0 to 100.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "14"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:23.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 991920
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "14"
:obset-id "14"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "14"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2764
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "14"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 2258
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "14"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "14"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)true40Epoch #2 in a sequence triggered by TOO (13) AT2022dsbTiming link suitability includes constraints ([Group (15 16) Within 5.0 days] [15 After 14 by 70.0 to 100.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "15"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:24.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 1026720
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "15"
:obset-id "15"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "15"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2764
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "15"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "15"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)true30NUV portion of epoch #3 in a sequence triggered by TOO (13) AT2022dsbTiming link suitability includes constraints ([Group (15 16) Within 5.0 days] [16 After 14 by 70.0 to 100.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "16"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:26.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 470048
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "16"
:obset-id "16"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "16"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2764
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "16"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "16"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2765
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3157
:pcs-gap 0
)true30FUV portion of epoch #3 in a sequence triggered by TOO (13) AT2022dsbTiming link suitability includes constraints ([22 After 21 by 176.0 to 226.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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(Tic-Visit
:proposal-id 16775
:visit-id "21"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:27.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "21"
:obset-id "21"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "21"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "21"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "21"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "21"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Target 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.Timing link suitability includes constraints ([22 After 21 by 176.0 to 226.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "22"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:28.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "22"
:obset-id "22"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "22"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "22"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "22"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "22"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Conditional 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.Timing link suitability includes constraints ([18 After 17 by 252.0 to 354.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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(Tic-Visit
:proposal-id 16775
:visit-id "17"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:29.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 2
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 2122800
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "17"
:obset-id "17"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "17"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "17"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true20Target 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.Timing link suitability includes constraints ([18 After 17 by 252.0 to 354.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "18"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:30.0"
:trans-errors '(:WARNINGS 1 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 4871328
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "18"
:obset-id "18"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "18"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "18"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "18"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "18"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Conditional 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.Timing link suitability includes constraints ([20 After 19 by 252.0 to 354.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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(Tic-Visit
:proposal-id 16775
:visit-id "19"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:32.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "19"
:obset-id "19"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "19"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "19"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "19"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "19"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Target 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.Timing link suitability includes constraints ([20 After 19 by 252.0 to 354.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "20"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:33.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 365952
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "20"
:obset-id "20"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "20"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2749
:al-overhead-at-end 0
:internal-dur-at-end 113
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "20"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 85
:internal-dur-at-end 132
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "20"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 0
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "20"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2750
:al-overhead-at-end 198
:internal-dur-at-end 319
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3142
:pcs-gap 0
)true40Conditional 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.Timing link suitability includes constraints ([24 After 23 by 137.0 to 174.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.This visit will use TIME-TAG mode.
It is followed by visit (24) for epoch #2(Tic-Visit
:proposal-id 16775
:visit-id "23"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:35.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 870176
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "23"
:obset-id "23"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "23"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2996
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "23"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 2026
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "23"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "23"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)true40AT2022hvp (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.Timing link suitability includes constraints ([24 After 23 by 137.0 to 174.0 days] [25 After 24 by 100.0 to 200.0 days] [26 After 24 by 100.0 to 200.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode./private/var/folders/s1/wrm78pt95d170cr669g4yxc40000gp/T/OPVisit8048207662337158167.xmlThis 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.(Tic-Visit
:proposal-id 16775
:visit-id "24"
:proposal-version -1
:trans-version "20220630"
:date "27-Oct-2022 17:07:27.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 4
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 852752
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "24"
:obset-id "24"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "24"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2996
:al-overhead-at-end 0
:internal-dur-at-end 178
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "24"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 2026
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "24"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "24"
:orbit-number 4
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)true40Epoch #2 in a sequence triggered by TOO (23) AT2022hvpTiming link suitability includes constraints ([Group (25 26) Within 5.0 days] [25 After 24 by 100.0 to 200.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "25"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:37.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 835392
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "25"
:obset-id "25"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "25"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2996
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
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(Tic-Orbit
:proposal-id 16775
:visit-id "25"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
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(Tic-Orbit
:proposal-id 16775
:visit-id "25"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)true30Epoch 3 in a sequence triggered by TOO (23) AT2022hvpTiming link suitability includes constraints ([Group (25 26) Within 5.0 days] [26 After 24 by 100.0 to 200.0 days])The scheduling data was generated by CASM 30.3.CASM was run in Phase II mode.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.(Tic-Visit
:proposal-id 16775
:visit-id "26"
:proposal-version -1
:trans-version "20220516"
:date "12-Jul-2022 17:48:38.0"
:trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0
:FATAL-ERRORS 0 :CONTINUABLE-FATALS 0)
:number-of-orbits 3
:saa-model "24"
:si-bright-earth-limb-angle 20.0
:data-volume 487472
:tdrss-contact-duration 0
:coron NIL
)
(Tic-Obset
:proposal-id 16775
:visit-id "26"
:obset-id "26"
:pcs-mode "FGS"
)
(Tic-Orbit
:proposal-id 16775
:visit-id "26"
:orbit-number 1
:pcs-time 393
:si-vis-utilization 2996
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "26"
:orbit-number 2
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 320
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)
(Tic-Orbit
:proposal-id 16775
:visit-id "26"
:orbit-number 3
:pcs-time 392
:si-vis-utilization 2997
:al-overhead-at-end 0
:internal-dur-at-end 582
:dark-offset NIL
:dark-utilization 0
:max-dark-utilization 1920
:low-sky "N"
:pcs-visibility 3389
:pcs-gap 0
)true30Epoch 3 in a sequence triggered by TOO (23) AT2022hvp