17767( 6) - 24-Jun-2025 13:15:02 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17767 Version: 6 Check-in Time: 24-Jun-2025 13:15:02 STScI Edit Number: 0 Title Unveiling TDE Accretion Disks at Late Times with UV Spectroscopy and XMM-Newton ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Ryan Chornock University of California - Berkeley Y CoI: Dr. Raffaella Margutti University of California - Berkeley N CoI: Dr. Yuhan Yao University of California - Berkeley N CoI: Dr. Kate Denham Alexander University of Arizona N CoI: Dr. Erica Hammerstein University of California - Berkeley N ------------------------------------------------------------------------------------ Abstract The tidal disruption of a star by a supermassive black hole produces broadband emission as the debris forms a disk and accretes. Most previous work has focused on observations near maximum light when the accretion disk may be obscured by a reprocessing layer. However, recent observations have shown that long-lived UV plateaus may be common in these events at late times as the unobscured accretion disk becomes visible. We propose the first STIS UV spectroscopic observations on these timescales combined with XMM-Newton observations to diagnose the properties of the accretion disk, the spectral shape of the ionizing continuum, and how these are reflected in the broad emission lines. These observations will open a new window of investigation into late-time multiwavelength properties of TDEs and will strengthen connections between previous work on AGN accretion and newly formed TDE accretion disks. ------------------------------------------------------------------------------------ Observations Description ------------------------ This proposal consists of non-disruptive ToO observations (up to 30 days response time) of 3 tidal disruption events (TDEs) for 8 orbits with HST + 15ks with XMM-Newton. Each TDE trigger will be for an old object, more than 200 days after optical discovery. We anticipate that our targets will be faint and in the range of 18th-21st AB magnitude on top of a host galaxy nucleus of similar optical brightness (but much fainter in the UV). For each TDE target, we need 8 orbits of observation: 4 with STIS/FUV-MAMA and 4 with STIS/NUV-MAMA. Due to the scheduling restriction that visits should be no longer than 3 orbits, we have broken up each TDE trigger into 3 visits: Visit 1: 3 orbits with STIS/FUV-MAMA using G140L and the 52x0.2D1 aperture (following advice in STIS handbook section 4.2.3 to place point sources near the D1 position for FUV) Visit 2: 3 orbits with STIS/NUV-MAMA using G230L with the 52x0.2 aperture Visit 3: 1 orbit with STIS/FUV-MAMA and 1 orbit with STIS/FUV-MAMA to complete the observation 17767( 6) - 24-Jun-2025 13:15:02 - [ 2] Each visit requires an ACQ in the first orbit. As these are triggered observations, we do not yet know the exact brightness of the TDE or the host. We expect that the TDE will be a UV-bright point source on top of a (much redder) galaxy nucleus. The ACQ process uses the STIS/CCD with the F28X50LP filter, but the host galaxy may dominate in the optical. I have entered placeholder parameters for a diffuse acquisition. The exposure times and checkbox size may be adjusted depending on the actual properties of the target, so we have not provided ETC output until the actual fluxes are known. A ToO Activation on TDE1 should activate Visits 01, 02, and 03. A ToO Activation on TDE2 should activate Visits 04, 05, and 06. A ToO Activation on TDE3 should activate Visits 07, 08, and 09. ------------------------------------------------------------------------------------ 17767( 6) - 24-Jun-2025 13:15:02 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2024TVD GALAXY, NUCLEUS, QUASAR RA=17H10M42.5722S +/- 0.0065", J2000 V = 20 DEC=+28D50'15.06" +/- 0.0011" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 5 AT2024TVD-OF STAR, UNDESIGNATED RA=17H10M42.9677S +/- 0.035", J2000 V = 17.1 +/- 0.3 FSET-STAR DEC=+28D49'40.93" +/- 0.04" Reference Frame: ICRS Epoch of Position RA proper motion (seconds of time/yr) DEC Proper Motion (arcsec/yr) Annual Parallax (arcsec) 2000 0.0 0.0 0.0 ------------------------------------------------------------------------------------------------------------------------------------ 6 AT2024LHC GALAXY, NUCLEUS RA=16H50M54.1500S, J2000 V = 20 DEC=+32D52'36.20" Reference Frame: ICRS Comments: Point source transient on top of r~18th mag host ------------------------------------------------------------------------------------------------------------------------------------ 7 AT2024AEPD GALAXY, NUCLEUS RA=15H25M39.3000S, J2000 V = 20 DEC=+17D40'50.38" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17767( 6) - 24-Jun-2025 13:15:02 - [ 4] TARGET LIST Generic Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria | Flux data No | Name | Description | | ------------------------------------------------------------------------------------------------------------------------------------ 1 TDE1 GALAXY, ACCRETION DISK, 1) TDE > 200 DAYS AFTER OPTICAL V = 19 +/- 2 NUCLEUS DISCOVERY 2) WITH UV MAGNITUDE BRIGHTER THAN M_UV < 21 AB MAG ------------------------------------------------------------------------------------------------------------------------------------ 2 TDE2 GALAXY, ACCRETION DISK, 1) TDE > 200 DAYS AFTER OPTICAL V = 19 +/- 2 NUCLEUS DISCOVERY 2) WITH UV MAGNITUDE BRIGHTER THAN M_UV < 21 AB MAG ------------------------------------------------------------------------------------------------------------------------------------ 3 TDE3 GALAXY, ACCRETION DISK, 1) TDE > 200 DAYS AFTER OPTICAL V = 19 +/- 2 NUCLEUS DISCOVERY 2) WITH UV MAGNITUDE BRIGHTER THAN M_UV < 21 AB MAG ------------------------------------------------------------------------------------------------------------------------------------ 17767( 6) - 24-Jun-2025 13:15:02 - [ 5] Visit: 01 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024TVD-O STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 30 S (30 FFSET-STAR S) Comments: This is an offset star. ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024TVD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 1500 S -MAMA see below (2063 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024TVD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2624 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2024TVD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024TVD-OFFSET-ST 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AR AT2024TVD 2 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 1 2063.0 S -MAMA AT2024TVD 3 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 2 2624.0 S -MAMA AT2024TVD 4 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 3 2624.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 6] Visit: 02 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024TVD-O STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 30 S (30 FFSET-STAR S) Comments: This is an offset star. ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024TVD STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (2063 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024TVD STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2624 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2024TVD STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024TVD-OFFSET-ST 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AR AT2024TVD 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2063.0 S -MAMA AT2024TVD 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2624.0 S -MAMA AT2024TVD 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 3 2624.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 7] Visit: 03 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024TVD-O STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=POINT 1 30 S (30 FFSET-STAR S) Comments: This is an offset star. ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024TVD STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (2035 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024TVD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2624 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024TVD-OFFSET-ST 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AR AT2024TVD 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 2035.0 S -MAMA AT2024TVD 3 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 2 2624.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 8] Visit: 04 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024LHC STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=DIFFUSE, CHECKBOX=13, 1 50 S (50 DIFFUSE-CENTER=FLUX-CENTROID S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024LHC STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 1500 S -MAMA see below (1947 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024LHC STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2626 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2024LHC STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2626 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024LHC 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024LHC 2 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 1 1947.0 S -MAMA AT2024LHC 3 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 2 2626.0 S -MAMA AT2024LHC 4 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 3 2626.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 9] Visit: 05 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024LHC STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=DIFFUSE, CHECKBOX=13, 1 50 S (50 DIFFUSE-CENTER=FLUX-CENTROID S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024LHC STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (1947 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024LHC STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2626 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2024LHC STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2626 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024LHC 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024LHC 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1947.0 S -MAMA AT2024LHC 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2626.0 S -MAMA AT2024LHC 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 3 2626.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 10] Visit: 06 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024LHC STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=DIFFUSE, CHECKBOX=13, 1 50 S (50 DIFFUSE-CENTER=FLUX-CENTROID S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024LHC STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (1919 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024LHC STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2626 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024LHC 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024LHC 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1919.0 S -MAMA AT2024LHC 3 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 2 2626.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 11] Visit: 07 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024AEPD STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=DIFFUSE, CHECKBOX=13, 1 50 S (50 DIFFUSE-CENTER=FLUX-CENTROID S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024AEPD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 1500 S -MAMA see below (1936 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024AEPD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2615 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2024AEPD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2615 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024AEPD 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024AEPD 2 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 1 1936.0 S -MAMA AT2024AEPD 3 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 2 2615.0 S -MAMA AT2024AEPD 4 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 3 2615.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 12] Visit: 08 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024AEPD STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=DIFFUSE, CHECKBOX=13, 1 50 S (50 DIFFUSE-CENTER=FLUX-CENTROID S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024AEPD STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (1936 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024AEPD STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2615 S) ------------------------------------------------------------------------------------------------------------------------------------ 4 AT2024AEPD STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2615 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024AEPD 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024AEPD 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1936.0 S -MAMA AT2024AEPD 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2615.0 S -MAMA AT2024AEPD 4 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 3 2615.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 13] Visit: 09 Visit Requirements: TOO RESPONSE TIME 30.0D On Hold Comments: Additional Comments: 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 AT2024AEPD STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=DIFFUSE, CHECKBOX=13, 1 50 S (50 DIFFUSE-CENTER=FLUX-CENTROID S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024AEPD STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (1908 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024AEPD STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2615 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024AEPD 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024AEPD 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1908.0 S -MAMA AT2024AEPD 3 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 2 2615.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 14] Visit: 10 Visit Requirements: On Hold Comments: Additional Comments: 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 AT2024LHC STIS/CCD ACQ F28X50LP MIRROR ACQTYPE=DIFFUSE, CHECKBOX=13, 1 50 S (50 DIFFUSE-CENTER=FLUX-CENTROID S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024LHC STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (1947 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024LHC STIS/NUV ACCUM 52X0.2 G230L 2376 1 2000 S -MAMA see below (2626 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024LHC 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024LHC 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1947.0 S -MAMA AT2024LHC 3 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 2 2626.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 15] Visit: 11 Visit Requirements: On Hold Comments: Additional Comments: 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 AT2024LHC STIS/CCD ACQ F28X50LP MIRROR 1 50 S (50 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 AT2024LHC STIS/NUV ACCUM 52X0.2 G230L 2376 1 1500 S -MAMA see below (1957 S) ------------------------------------------------------------------------------------------------------------------------------------ 3 AT2024LHC STIS/FUV ACCUM 52X0.2D1 G140L 1425 1 2000 S -MAMA see below (2626 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 | ------------------------------------------------------------------------------------------------------------------------------------ AT2024LHC 1 STIS/CCD ACQ F28X50LP MIRROR none none none none 1 N/A AT2024LHC 2 STIS/NUV ACCUM 52X0.2 G230L 2376 none none none none 1 1957.0 S -MAMA AT2024LHC 3 STIS/FUV ACCUM 52X0.2D1 G140L 1425 none none none none 2 2626.0 S -MAMA 17767( 6) - 24-Jun-2025 13:15:02 - [ 16] Summary Form for Proposal 17767 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures 52X0.2, 52X0.2D1, F28X50LP ------------------------------------------------------------------------------------------------------------------------------------ Configurations STIS/CCD, STIS/FUV-MAMA, STIS/NUV-MAMA ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, ACQ ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ACQTYPE=DIFFUSE, ACQTYPE=POINT, CHECKBOX=13, DIFFUSE-CENTER=FLUX-CENTROID ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements TOO RESPONSE TIME 30.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements G140L, G230L, MIRROR ------------------------------------------------------------------------------------------------------------------------------------ Target Names AT2024AEPD, AT2024LHC, AT2024TVD, AT2024TVD-OFFSET-STAR ------------------------------------------------------------------------------------------------------------------------------------