17840( 6) - 06-Feb-2026 15:55:09 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 17840 Version: 6 Check-in Time: 06-Feb-2026 15:55:09 STScI Edit Number: 0 Title Gamma-ray burst supernovae across cosmic time ------------------------------------------------------------------------------------ Type Cycle GO 32 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Andrew James Levan Radboud University Nijmegen Y CoI: Dr. Luca Izzo INAF - Osservatorio Astronomico di N Capodimonte CoI: Prof. Jens Hjorth University of Copenhagen, Niels Bohr N Institute CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Prof. Nial Rahil Tanvir University of Leicester N ------------------------------------------------------------------------------------ Abstract Long-duration gamma-ray bursts (GRBs) are the most luminous stellar explosions in nature and are associated with the collapse of massive stars. GRBs are bright enough to see at great distances, with a median redshift of z>2 and some GRBs seen out to z>8, perhaps even z>9. Therefore, they pinpoint the locations of supernovae at distances where we have never directly observed them. Here we propose to measure the evolution of three GRB supernovae at 1.5 < z < 3 for the first time. These observations give us the ability to test if supernovae (in particular GRB-SNe) change with redshift. Differences in metallicity and stellar winds are quite likely to alter the evolution of massive stars with redshift. This is especially true if rare pathways only accessible at low metallicities, such as chemically homogeneous evolution, begin to dominate the lives of GRB progenitors. Since supernovae are a vital feedback mechanism to the interstellar and intergalactic medium via elements ejection and winds, a change in the properties of supernovae could have significant implications not only for the progenitors of GRBs but also for galaxy evolution more generally. Our photometric observations will determine the peak magnitude and decay, while a single JWST spectrum at peak will measure composition and velocities. This will provide a measurement of radioactive nickel production and luminosity. From this, we can begin to ascertain how the properties of GRB progenitors, and by extension massive stars, vary over cosmic time. ------------------------------------------------------------------------------------ Observations Description ------------------------ Our aim is to study the evolution of GRB supernovae at 1.5 < z < 3.0 via 5 epochs of HST imaging (4 during the SN phase and one late time template). At each epoch we will obtain an optical (rest-frame UV) observation to track the afterglow and an IR (rest-frame optical) filter to track the supernova. We have set three possible set-ups depending on the redshfit of the supernova and the available ground based data (F606W/F125W, F606W/F140W and F606W/F160W) and we will use different IR filters depending on the redshift in order to track the supernova at similar rest-frame wavelengths. At each epochs we will use 1 orbit visits in each filter with a 4-point dither. 17840( 6) - 06-Feb-2026 15:55:09 - [ 2] The visit should be sceduled within +/- 2 days of each other. At later epochs we will switch to 2 orbit visits per filter with an 8-point dither in the IR and a 6 point dither in the optical. Our observational plan is to ask for observations ~10-15 x (1+z) days apart and so we will schedule the first two epochs of observations at one time, but make adjust our strategy for the later observations on the basis of the outcome of the first observations. We will observe 3 supernovae in total with 30 orbits in Cycle 31 and 12 in Cycle 32 for host subtraction. However, because of differences in supernovae (redshift, hosts etc) we may not use 10 orbits per SNe. This new submission for GO17840 is for the late time templates, and contains observations for 2 orbits each in F606W, F125W, F140W and F160W. We will update with the details of the timing and sources once they are known. ------------------------------------------------------------------------------------ 17840( 6) - 06-Feb-2026 15:55:09 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 GRB240801A EXT-STAR, GAMMA RAY RA=23H00M39.0190S, J2000 V = 25 +/- 1 BURSTER, SUPERNOVA DEC=+32D35'37.20" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 5 GRB241026A EXT-STAR, GAMMA RAY RA=19H33M36.0600S, J2000 V = 25 +/- 1 BURSTER, SUPERNOVA DEC=+57D59'9.04" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 6 GRB240414A EXT-STAR, GAMMA RAY RA=12H19M8.1120S, J2000 V = 25 +/- 1 BURSTER, SUPERNOVA DEC=+56D44'28.70" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 7 GRB230818A EXT-STAR, SUPERNOVA RA=19H03M33.1200S +/- 0.2", J2000 V = 27 +/- 2 DEC=+40D53'49.10" +/- 0.2" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 17840( 6) - 06-Feb-2026 15:55:09 - [ 4] TARGET LIST Generic Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria | Flux data No | Name | Description | | ------------------------------------------------------------------------------------------------------------------------------------ 3 GRB3 GRB DETECTION AT ~ 1.5 < Z < 3.0 V = 26 ------------------------------------------------------------------------------------------------------------------------------------ 17840( 6) - 06-Feb-2026 15:55:09 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type LINE WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER DITHER Number_Of_Points 2 3 Point_Spacing 0.099 0.135 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 3.9 46.84 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type LINE WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER DITHER Number_Of_Points 2 4 Point_Spacing 0.145 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 46.84 18.528 Angle_Between_Sides 74.653 Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 5 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.572 Line_Spacing 0.365 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 6 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.173 Line_Spacing 0.112 Coordinate_Frame POS-TARG Pattern_Orient 23.884 Angle_Between_Sides 81.785 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 17840( 6) - 06-Feb-2026 15:55:09 - [ 6] Visit: A1 Visit Requirements: SCHED 100%; BEFORE 31-MAY-2025:00:00:00; TOO RESPONSE TIME 21.0D 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 GRB240801A WFC3/IR MULTIAC IR F140W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 4 1 CUM (4423.498 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB240801A 1 WFC3/IR MULTIAC IR F140W 1 1 none none 1 N/A CUM GRB240801A 1 WFC3/IR MULTIAC IR F140W 1 2 none none 1 N/A CUM GRB240801A 1 WFC3/IR MULTIAC IR F140W 1 3 none none 1 N/A CUM GRB240801A 1 WFC3/IR MULTIAC IR F140W 1 4 none none 1 N/A CUM GRB240801A 1 WFC3/IR MULTIAC IR F140W 2 1 none none 2 N/A CUM GRB240801A 1 WFC3/IR MULTIAC IR F140W 2 2 none none 2 N/A CUM GRB240801A 1 WFC3/IR MULTIAC IR F140W 2 3 none none 2 N/A CUM GRB240801A 1 WFC3/IR MULTIAC IR F140W 2 4 none none 2 N/A CUM 17840( 6) - 06-Feb-2026 15:55:09 - [ 7] Visit: A2 Visit Requirements: SCHED 100%; BEFORE 31-MAY-2025:00:00:00; TOO RESPONSE TIME 21.0D 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 GRB240801A WFC3/UVI ACCUM UVIS2 F606W CR-SPLIT=NO 1 740 S POS TARG -65, -30; S (4440 S) PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB240801A 1 WFC3/UVI ACCUM UVIS2 F606W 1 1 none none 1 N/A S GRB240801A 1 WFC3/UVI ACCUM UVIS2 F606W 1 2 none none 1 N/A S GRB240801A 1 WFC3/UVI ACCUM UVIS2 F606W 1 3 none none 1 N/A S GRB240801A 1 WFC3/UVI ACCUM UVIS2 F606W 2 1 none none 2 N/A S GRB240801A 1 WFC3/UVI ACCUM UVIS2 F606W 2 2 none none 2 N/A S GRB240801A 1 WFC3/UVI ACCUM UVIS2 F606W 2 3 none none 2 N/A S 17840( 6) - 06-Feb-2026 15:55:09 - [ 8] Visit: A3 Visit Requirements: SCHED 100%; BETWEEN 01-OCT-2025:00:00:00 AND 30-NOV-2025:00:00:00; TOO RESPONSE TIME 21.0D 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 GRB241026A WFC3/IR MULTIAC IR F160W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 4 1 CUM (4423.498 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB241026A 1 WFC3/IR MULTIAC IR F160W 1 1 none none 1 N/A CUM GRB241026A 1 WFC3/IR MULTIAC IR F160W 1 2 none none 1 N/A CUM GRB241026A 1 WFC3/IR MULTIAC IR F160W 1 3 none none 1 N/A CUM GRB241026A 1 WFC3/IR MULTIAC IR F160W 1 4 none none 1 N/A CUM GRB241026A 1 WFC3/IR MULTIAC IR F160W 2 1 none none 2 N/A CUM GRB241026A 1 WFC3/IR MULTIAC IR F160W 2 2 none none 2 N/A CUM GRB241026A 1 WFC3/IR MULTIAC IR F160W 2 3 none none 2 N/A CUM GRB241026A 1 WFC3/IR MULTIAC IR F160W 2 4 none none 2 N/A CUM 17840( 6) - 06-Feb-2026 15:55:09 - [ 9] Visit: A4 Visit Requirements: SCHED 100%; BETWEEN 01-OCT-2025:00:00:00 AND 30-NOV-2025:00:00:00; TOO RESPONSE TIME 21.0D 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 GRB241026A WFC3/UVI ACCUM UVIS2 F606W CR-SPLIT=NO 1 740 S POS TARG -65, -30; S (4440 S) PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB241026A 1 WFC3/UVI ACCUM UVIS2 F606W 1 1 none none 1 N/A S GRB241026A 1 WFC3/UVI ACCUM UVIS2 F606W 1 2 none none 1 N/A S GRB241026A 1 WFC3/UVI ACCUM UVIS2 F606W 1 3 none none 1 N/A S GRB241026A 1 WFC3/UVI ACCUM UVIS2 F606W 2 1 none none 2 N/A S GRB241026A 1 WFC3/UVI ACCUM UVIS2 F606W 2 2 none none 2 N/A S GRB241026A 1 WFC3/UVI ACCUM UVIS2 F606W 2 3 none none 2 N/A S 17840( 6) - 06-Feb-2026 15:55:09 - [ 10] Visit: A5 Visit Requirements: SCHED 100%; BEFORE 31-DEC-2025:00:00:00; TOO RESPONSE TIME 21.0D 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 GRB230818A WFC3/IR MULTIAC IR F140W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 4 1 CUM (4423.498 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB230818A 1 WFC3/IR MULTIAC IR F140W 1 1 none none 1 N/A CUM GRB230818A 1 WFC3/IR MULTIAC IR F140W 1 2 none none 1 N/A CUM GRB230818A 1 WFC3/IR MULTIAC IR F140W 1 3 none none 1 N/A CUM GRB230818A 1 WFC3/IR MULTIAC IR F140W 1 4 none none 1 N/A CUM GRB230818A 1 WFC3/IR MULTIAC IR F140W 2 1 none none 2 N/A CUM GRB230818A 1 WFC3/IR MULTIAC IR F140W 2 2 none none 2 N/A CUM GRB230818A 1 WFC3/IR MULTIAC IR F140W 2 3 none none 2 N/A CUM GRB230818A 1 WFC3/IR MULTIAC IR F140W 2 4 none none 2 N/A CUM 17840( 6) - 06-Feb-2026 15:55:09 - [ 11] Visit: A6 Visit Requirements: SCHED 100%; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Awaiting GRB trigger 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 GRB3 WFC3/UVI ACCUM UVIS2 F606W CR-SPLIT=NO 1 740 S POS TARG -65, -30; S (4440 S) PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB3 1 WFC3/UVI ACCUM UVIS2 F606W 1 1 none none 1 N/A S GRB3 1 WFC3/UVI ACCUM UVIS2 F606W 1 2 none none 1 N/A S GRB3 1 WFC3/UVI ACCUM UVIS2 F606W 1 3 none none 1 N/A S GRB3 1 WFC3/UVI ACCUM UVIS2 F606W 2 1 none none 2 N/A S GRB3 1 WFC3/UVI ACCUM UVIS2 F606W 2 2 none none 2 N/A S GRB3 1 WFC3/UVI ACCUM UVIS2 F606W 2 3 none none 2 N/A S 17840( 6) - 06-Feb-2026 15:55:09 - [ 12] Visit: G1 Visit Requirements: SCHED 100%; BEFORE 31-JUL-2025:00:00:00; ON HOLD ; TOO RESPONSE TIME 21.0D On Hold Comments: Awaiting GRB trigger 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 GRB240414A WFC3/IR MULTIAC IR F160W SAMP-SEQ=SPARS50, NSAMP=12 1 DEF PATTERN 5 1 CUM (2211.749 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB240414A 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB240414A 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB240414A 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB240414A 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 17840( 6) - 06-Feb-2026 15:55:09 - [ 13] Visit: G2 Visit Requirements: SCHED 100%; BEFORE 31-JUL-2025:00:00:00 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 GRB240414A WFC3/UVI ACCUM UVIS2 F606W CR-SPLIT=NO 1 520 S POS TARG -65, -30; S (2080 S) PATTERN 6 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB240414A 1 WFC3/UVI ACCUM UVIS2 F606W 1 none none none 1 N/A S GRB240414A 1 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB240414A 1 WFC3/UVI ACCUM UVIS2 F606W 3 none none none 1 N/A S GRB240414A 1 WFC3/UVI ACCUM UVIS2 F606W 4 none none none 1 N/A S 17840( 6) - 06-Feb-2026 15:55:09 - [ 14] Visit: G3 Visit Requirements: SCHED 100%; BEFORE 20-MAR-2026:00:00:00 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 GRB230818A WFC3/UVI ACCUM UVIS2 F606W CR-SPLIT=NO 1 520 S POS TARG -65, -30; S (2080 S) PATTERN 6 1 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB230818A 1 WFC3/UVI ACCUM UVIS2 F606W 1 none none none 1 N/A S GRB230818A 1 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB230818A 1 WFC3/UVI ACCUM UVIS2 F606W 3 none none none 1 N/A S GRB230818A 1 WFC3/UVI ACCUM UVIS2 F606W 4 none none none 1 N/A S 17840( 6) - 06-Feb-2026 15:55:09 - [ 15] Summary Form for Proposal 17840 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, NSAMP=12, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 20-MAR-2026:00:00:00, BEFORE 31-DEC-2025:00:00:00, BEFORE 31-JUL-2025:00:00:00, BEFORE 31-MAY-2025:00:00:00, BETWEEN 01-OCT-2025:00:00:00 AND 30-NOV-2025:00:00:00, ON HOLD , PATTERN 3 1, PATTERN 4 1, PATTERN 5 1, PATTERN 6 1, POS TARG -65, -30, SCHED 100%, TOO RESPONSE TIME 21.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140W, F160W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB230818A, GRB240414A, GRB240801A, GRB241026A, GRB3 ------------------------------------------------------------------------------------------------------------------------------------