13611( 25) - 30-Jul-2014 16:49:33 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13611 Version: 25 Check-in Time: 30-Jul-2014 16:49:33 STScI Edit Number: 23 Title The nature of the low redshift ultra-long GRB130925A: core collapse or tidal disruption? ------------------------------------------------------------------------------------ Type Cycle GO/DD 21 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Nial R. Tanvir University of Leicester Y CoI: Dr. Stephen Bradley Cenko NASA Goddard Space Flight Center N CoI: Dr. Daniel Perley California Institute of Technology N CoI: Prof. Andrew J. Levan The University of Warwick N CoI: Dr. Paul T. O'Brien University of Leicester N CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract In the past three years several cosmological high-energy transients have been found by Swift and other satellites that have durations of at least several hours, well above the typical few minute durations of classical long-GRBs. The origin of these so-called "ultra-long" bursts remains very uncertain due to the small number found and their comparatively high redshifts. They could be produced by some kind of massive star core-collapse, like ordinary long-GRBs but perhaps with a more extended progenitor star, or alternatively via a relativistic jet produced in a tidal disruption event, similar to the well-studied source Swift J1644+57. Recently a new ultra-long duration burst was identified, GRB 130925A, at a redshift of only z=0.35, which is close enough to allow a deep search for any accompanying supernova event with HST, and also detailed constraints on the location of the transient with respect to the nucleus of its host galaxy. This promises to provide the definitive test of core-collapse vs TDE models for these events. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose three pairs visits, the first pair as soon as possible to monitor around the peak of any supernova light, the second pair a few weeks later when the transient light should largely have disappeared, and a final visits a few months later which will be assuredly only host light. Each pair of visits is intended to be split between IR (F110 and F160) and optical (F814) exposures. ------------------------------------------------------------------------------------ 13611( 25) - 30-Jul-2014 16:49:33 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB130925A STAR, GAMMA RAY BURSTER RA=02H44M42.9600S +/- 0.5", J2000 V = 22 +/- 0.3 DEC=-26D09'11.20" +/- 0.5" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13611( 25) - 30-Jul-2014 16:49:33 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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: 2 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BLOB WFC3-IR-DITHER-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 2 2 Point_Spacing 5.183 0.636 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 41.859 41.788 Angle_Between_Sides Center_Pattern NO NO ------------------------------------------------------------------------------------------------------------------------------------ 13611( 25) - 30-Jul-2014 16:49:33 - [ 4] 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 GRB130925A WFC3/IR MULTIAC IR F110W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF GS ACQ SCENARIO ONEB1B3; CUM (1211.74 PATTERN 1 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB130925A WFC3/IR MULTIAC IR F160W NSAMP=6, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 2 CUM (1011.738 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130925A 1 WFC3/IR MULTIAC IR F110W 1 none none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 2 none none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 3 none none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 4 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 13611( 25) - 30-Jul-2014 16:49:33 - [ 5] Visit: 02 Visit Requirements: SAME ORIENT AS 01; GROUP 02, 01 WITHIN 1D 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 GRB130925A WFC3/UVI ACCUM UVIS2 F814W CR-SPLIT=NO 1 600 S GS ACQ SCENARIO ONEB1B3; S (2400 S) PATTERN 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 1 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 2 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 3 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 4 none none none 1 N/A S 13611( 25) - 30-Jul-2014 16:49:33 - [ 6] Visit: 03 Visit Requirements: AFTER 01 BY 25 D TO 40 D 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 GRB130925A WFC3/IR MULTIAC IR F110W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF GS ACQ SCENARIO ONEB1B3; CUM (1211.74 PATTERN 1 1 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB130925A WFC3/IR MULTIAC IR F160W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF PATTERN 1 2 CUM (1211.74 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130925A 1 WFC3/IR MULTIAC IR F110W 1 none none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 2 none none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 3 none none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 4 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 13611( 25) - 30-Jul-2014 16:49:33 - [ 7] Visit: 04 Visit Requirements: SAME ORIENT AS 03; GROUP 04, 03 WITHIN 5D 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 GRB130925A WFC3/UVI ACCUM UVIS2 F814W CR-SPLIT=NO 1 600 S GS ACQ SCENARIO ONEB1B3; S (2400 S) PATTERN 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 1 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 2 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 3 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 4 none none none 1 N/A S 13611( 25) - 30-Jul-2014 16:49:33 - [ 8] Visit: 05 Visit Requirements: ORIENT 285D TO 285 D; BEFORE 25-AUG-2014:00:00:00 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 GRB130925A WFC3/IR MULTIAC IR F110W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF POS TARG CUM (1211.74 -9.781901438715447, S) -35.27975702180538; GS ACQ SCENARIO ONEB1B3; PATTERN 3 1 ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB130925A WFC3/IR MULTIAC IR F160W NSAMP=7, SAMP-SEQ=SPARS50 1 DEF POS TARG CUM (1211.74 -9.781901438715447, S) -35.27975702180538; 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130925A 1 WFC3/IR MULTIAC IR F110W 1 1 none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 1 2 none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 2 1 none none 1 N/A CUM GRB130925A 1 WFC3/IR MULTIAC IR F110W 2 2 none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 1 1 none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 1 2 none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 2 1 none none 1 N/A CUM GRB130925A 2 WFC3/IR MULTIAC IR F160W 2 2 none none 1 N/A CUM 13611( 25) - 30-Jul-2014 16:49:33 - [ 9] Visit: 06 Visit Requirements: SAME ORIENT AS 05; BEFORE 25-AUG-2014:00:00:00 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 GRB130925A WFC3/UVI ACCUM UVIS2 F814W CR-SPLIT=NO 1 600 S GS ACQ SCENARIO ONEB1B3; S (2400 S) PATTERN 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 1 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 2 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 3 none none none 1 N/A S GRB130925A 1 WFC3/UVI ACCUM UVIS2 F814W 4 none none none 1 N/A S 13611( 25) - 30-Jul-2014 16:49:33 - [ 10] Summary Form for Proposal 13611 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, NSAMP=6, NSAMP=7, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 25 D TO 40 D, BEFORE 25-AUG-2014:00:00:00, GROUP 02, 01 WITHIN 1D, GROUP 04, 03 WITHIN 5D, GS ACQ SCENARIO ONEB1B3, ORIENT 285D TO 285 D, PATTERN 1 1, PATTERN 1 2, PATTERN 2 1, PATTERN 3 1, PATTERN 3 2, POS TARG -9.781901438715447, -35.27975702180538, SAME ORIENT AS 01, SAME ORIENT AS 03, SAME ORIENT AS 05 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F814W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB130925A ------------------------------------------------------------------------------------------------------------------------------------