16051( 7) - 24-Mar-2020 12:56:56 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 16051 Version: 7 Check-in Time: 24-Mar-2020 12:56:56 STScI Edit Number: 2 Title A long gamma-ray burst in an ancient galaxy ------------------------------------------------------------------------------------ Type Cycle GO/DD 27 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Andrew James Levan Radboud Universiteit Nijmegen Y CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Dr. Daniel Perley Liverpool John Moores University N CoI: Prof. Johan P. U. Fynbo University of Copenhagen, Niels Bohr N Institute CoI: Dr. Daniele Bjorn Malesani Technical University of Denmark-DTU Space N CoI: Prof. Nial Rahil Tanvir University of Leicester N CoI: Dr. Antonio de Ugarte Postigo Instituto de Astrofisica de Andalucia N (IAA) CoI: Mr. Jose Feliciano Agui Fernandez Instituto de Astrofisica de Andalucia N (IAA) CoI: Prof. Jens Hjorth University of Copenhagen, Niels Bohr N Institute CoI: Kornpob Bhirombhakdi Space Telescope Science Institute N CoI: Tuomas Kangas Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract Long-duration gamma-ray bursts are securely associated with the collapse of massive stars, and like core-collapse supernovae are always found in star-forming environments. The recent identification of GRB 191019A in a passive galaxy is, therefore, a major surprise. The source is close to the host nucleus (chance probability ~10^-6) and so is securely associated with the host. It is, therefore, imperative to determine the origin of the burst - does it arise from a core-collapse supernova in an environment never before seen for a long GRB? Was the event created via rare different channels (unusual binary evolution, dynamical interactions etc.) and so is it associated with a different kind of supernova? Does the proximity of the burst to its host nucleus imply a direct connection to the supermassive black hole, due either to unusual AGN activity or a tidal disruption event (TDE)? We propose a modest set of HST observations that will conclusively answer these questions. We will: (i) perform the most sensitive possible search for any associated supernova; (ii) pinpoint the source within its host galaxy with exceptional accuracy to determine if it may be associated with a TDE around a supermassive black hole; and (iii) track the decay to ascertain if the source vanishes or fades into an underlying active galaxy. These observations can conclusively determine the origin of GRB 191019A, and so provide direct constraints on the diversity of processes that can create gamma-ray burst-like explosions. ------------------------------------------------------------------------------------ Observations Description ------------------------ We request to obtain two orbits of ACS grism observations of GRB 191019A in an apparently passive galaxy at z=0.23. Our experimental design is simple.We will 16051( 7) - 24-Mar-2020 12:56:56 - [ 2] obtain epochs 180 degrees (and approximately 180 days) apart to get a good subtraction of the host galaxy light. At each epoch we will obtain 1 F606W image (180s) duration and 4x400s exposures in G800L with a standard 4-point dither pattern. ------------------------------------------------------------------------------------ 16051( 7) - 24-Mar-2020 12:56:56 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB191019A GALAXY, ELLIPTICAL, RA=22H40M5.8600S, J2000 V = 18 +/- 1 STAR FORMING REGION DEC=-17D19'41.30" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 16051( 7) - 24-Mar-2020 12:56:56 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.262 Line_Spacing 0.192 Coordinate_Frame POS-TARG Pattern_Orient 18.39 Angle_Between_Sides 68.14 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 3.034 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 85.29 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.604 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 16051( 7) - 24-Mar-2020 12:56:56 - [ 5] Visit: 01 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 GRB191019A ACS/WFC ACCUM WFC-FIX G800L 1 400 S POS TARG 75, -95; (1600 S) PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB191019A 1 ACS/WFC ACCUM WFC-FIX G800L 1 none none none 1 N/A GRB191019A 1 ACS/WFC ACCUM WFC-FIX G800L 2 none none none 1 N/A GRB191019A 1 ACS/WFC ACCUM WFC-FIX G800L 3 none none none 1 N/A GRB191019A 1 ACS/WFC ACCUM WFC-FIX G800L 4 none none none 1 N/A 16051( 7) - 24-Mar-2020 12:56:56 - [ 6] Visit: 02 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 GRB191019A ACS/WFC ACCUM WFC-FIX F606W 1 340 S (680 POS TARG 75, -95; S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB191019A ACS/WFC ACCUM WFC-FIX G800L AUTOIMAGE=NO 1 360 S POS TARG 75, -95; (1080 S) PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB191019A 1 ACS/WFC ACCUM WFC-FIX F606W 1 none none none 1 N/A GRB191019A 1 ACS/WFC ACCUM WFC-FIX F606W 2 none none none 1 N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 1 none none none 1 N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 2 none none none 1 N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 3 none none none 1 N/A 16051( 7) - 24-Mar-2020 12:56:56 - [ 7] Visit: 03 Visit Requirements: ORIENT 180.0D TO 180.0D FROM 01 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 GRB191019A ACS/WFC ACCUM WFC-FIX F606W 1 340 S (680 POS TARG 65, -85; SEQ S) 1-2 NON-INT; PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB191019A ACS/WFC ACCUM WFC-FIX G800L AUTOIMAGE=NO 1 360 S POS TARG 65, -85; (1080 S) PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB191019A 1 ACS/WFC ACCUM WFC-FIX F606W 1 none none none tbd N/A GRB191019A 1 ACS/WFC ACCUM WFC-FIX F606W 2 none none none tbd N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 1 none none none tbd N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 2 none none none tbd N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 3 none none none tbd N/A 16051( 7) - 24-Mar-2020 12:56:56 - [ 8] Visit: 04 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 GRB191019A ACS/WFC ACCUM WFC-FIX F606W 1 340 S (680 POS TARG 55, -75; S) PATTERN 2 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB191019A ACS/WFC ACCUM WFC-FIX G800L AUTOIMAGE=NO 1 360 S POS TARG 55, -75; (1080 S) PATTERN 3 2 ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB191019A 1 ACS/WFC ACCUM WFC-FIX F606W 1 none none none 1 N/A GRB191019A 1 ACS/WFC ACCUM WFC-FIX F606W 2 none none none 1 N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 1 none none none 1 N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 2 none none none 1 N/A GRB191019A 2 ACS/WFC ACCUM WFC-FIX G800L 3 none none none 1 N/A 16051( 7) - 24-Mar-2020 12:56:56 - [ 9] Summary Form for Proposal 16051 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters AUTOIMAGE=NO ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 180.0D TO 180.0D FROM 01, PATTERN 1 1, PATTERN 2 1, PATTERN 3 2, POS TARG 55, -75, POS TARG 65, -85, POS TARG 75, -95, SEQ 1-2 NON-INT ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W, G800L ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB191019A ------------------------------------------------------------------------------------------------------------------------------------