12378( 5) - 30-Sep-2011 18:46:42 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12378 Version: 5 Check-in Time: 30-Sep-2011 18:46:42 STScI Edit Number: 0 Title The differing environments of dark gamma-ray bursts ------------------------------------------------------------------------------------ Type Cycle GO 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Andrew J. Levan The University of Warwick CoI: Prof. Nial R. Tanvir University of Leicester N CoI: Prof. Jens Hjorth University of Copenhagen, Niels Bohr N Institute CoI: Dr. Paul T. O'Brien University of Leicester N CoI: Dr. Karl Svensson The University of Warwick N CoI: Dr. Darach Watson University of Copenhagen, Niels Bohr N Institute CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Dr. Daniele Malesani University of Copenhagen, Niels Bohr N Institute ------------------------------------------------------------------------------------ Abstract Dark gamma-ray bursts (GRBs) -- where the optical emission is apparently suppressed -- can only be reliably localized by their X-ray afterglows. Here we propose to complete a survey using the sensitivity and point spread function of Chandra to precisely pinpoint the GRB locations, and HST to locate and study the host galaxies. Our results to date are suggestive of dark GRBs originating in more luminous and (so far exclusively) merging galaxies. Our increased sample will allow us to make strong statistical statements as to these differences and so elucidate both the nature of dark GRBs, and the relationships between GRBs and both obscured and unobscured star formation. ------------------------------------------------------------------------------------ Observations Description ------------------------ The aim of this programme is to obtain HST optical and IR observations of the host galaxies of dark GRBs in order to characterize their morphologies and magnitudes in the optical and IR. We will utilize one of two strategies, depending on the outcome of our optical afterglow searches. i) if the searches are unsucessful at finding an afterglow (i.e. show the burst is dark), but do suggest a host galaxy we will obtain WFC3 F606W and F160W observations in a single orbit observation ii) If deep optical observations do not show a candidate host we will observe a single orbit in ACS/F606W and WFC3/F160W to achieve extra depth. For our single orbit two colour observations we will utilize a 3 point dither to provide the best compromise between dithering/cosmic ray rejection and depth. Our full orbit per colour observations will use a standard 4 point dither. Real Time Justification 12378( 5) - 30-Sep-2011 18:46:42 - [ 2] ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12378( 5) - 30-Sep-2011 18:46:42 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 6 GRB-110328A EXT-STAR, X-RAY RA=16H44M49.9300S +/- 0.1", J2000 V = 23 TRANSIENT DEC=+57D34'59.70" +/- 0.1" Reference Frame: ICRS Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 7 GRB110312A UNIDENTIFIED, GAMMA RAY RA=10H29M55.4700S +/- 0.1", J2000 V = 25 +/- 2 EMITTER DEC=-05D15'45.20" +/- 0.1" Reference Frame: Other: Swift ------------------------------------------------------------------------------------------------------------------------------------ 8 GRB110709B GALAXY, HIGH REDSHIFT RA=10H58M37.0900S +/- 1", J2000 V = 25 +/- 1 GALAXY DEC=-23D27'17.60" +/- 1" Reference Frame: Other: Chandra ------------------------------------------------------------------------------------------------------------------------------------ 12378( 5) - 30-Sep-2011 18:46:42 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 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: 5 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 6 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-MOS-DITH-LINE WFC3-UVIS-MOS-DITH-LINE Pattern_Purpose DITHER DITHER Number_Of_Points 3 2 Point_Spacing 0.135 0.0992 Line_Spacing Coordinate_Frame POS-TARG POS-TARG Pattern_Orient 46.84 3.93 Angle_Between_Sides Center_Pattern YES NO ------------------------------------------------------------------------------------------------------------------------------------ 12378( 5) - 30-Sep-2011 18:46:42 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 7 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 ------------------------------------------------------------------------------------------------------------------------------------ 12378( 5) - 30-Sep-2011 18:46:42 - [ 6] Visit: D1 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB110312A WFC3/UVI ACCUM UVIS F606W CR-SPLIT=NO 1 370 S PATTERN 2 1 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB110312A WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF PATTERN 5 2 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB110312A 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 N/A S GRB110312A 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 N/A S GRB110312A 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 N/A S GRB110312A 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB110312A 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB110312A 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM 12378( 5) - 30-Sep-2011 18:46:42 - [ 7] Visit: D2 Visit Requirements: ORIENT 117D TO 125 D; BEFORE 31-AUG-2011:23:59:59 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB-110328A WFC3/IR MULTIAC IR F160W NSAMP=8, SAMP-SEQ=SPARS50 1 DEF PATTERN 4 1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB-110328A WFC3/UVI ACCUM UVIS F606W CR-SPLIT=NO 1 370 S PATTERN 6 2 S see below ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB-110328A 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB-110328A 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB-110328A 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB-110328A 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM GRB-110328A 2 WFC3/UVI ACCUM UVIS F606W 1 1 none none 1 640 S S GRB-110328A 2 WFC3/UVI ACCUM UVIS F606W 1 2 none none 1 640 S S GRB-110328A 2 WFC3/UVI ACCUM UVIS F606W 2 1 none none 2 720 S S GRB-110328A 2 WFC3/UVI ACCUM UVIS F606W 2 2 none none 2 720 S S GRB-110328A 2 WFC3/UVI ACCUM UVIS F606W 3 1 none none 2 720 S S GRB-110328A 2 WFC3/UVI ACCUM UVIS F606W 3 2 none none 2 720 S S 12378( 5) - 30-Sep-2011 18:46:42 - [ 8] Visit: D3 Visit Requirements: ON HOLD On Hold Comments: Awaiting Dark GRB position from Chandra Additional Comments: Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB-110328A WFC3/UVI ACCUM UVIS F606W CR-SPLIT=NO 1 365 S PATTERN 2 1 S see below ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB-110328A WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF PATTERN 5 2 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB-110328A 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 371.0 S S GRB-110328A 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 371.0 S S GRB-110328A 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 371.0 S S GRB-110328A 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB-110328A 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB-110328A 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM 12378( 5) - 30-Sep-2011 18:46:42 - [ 9] Visit: W1 Visit Requirements: ORIENT 297D TO 7 D; ORIENT 27D TO 97 D; ORIENT 117D TO 187 D; ORIENT 207D TO 277 D; ON HOLD On Hold Comments: Awaiting dark 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB110709B WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 4 1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB110709B 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB110709B 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB110709B 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB110709B 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 12378( 5) - 30-Sep-2011 18:46:42 - [ 10] Visit: W2 Visit Requirements: SAME ORIENT AS W1; ON HOLD On Hold Comments: Awaiting dark 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB110709B WFC3/UVI ACCUM UVIS F606W 1 620 S PATTERN 7 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB110709B 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 N/A S GRB110709B 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 N/A S GRB110709B 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 N/A S GRB110709B 1 WFC3/UVI ACCUM UVIS F606W 4 none none none 1 N/A S 12378( 5) - 30-Sep-2011 18:46:42 - [ 11] Summary Form for Proposal 12378 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, NSAMP=14, NSAMP=8, NSAMP=9, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 31-AUG-2011:23:59:59, ON HOLD , ORIENT 117D TO 125 D, ORIENT 117D TO 187 D, ORIENT 207D TO 277 D, ORIENT 27D TO 97 D, ORIENT 297D TO 7 D, PATTERN 2 1, PATTERN 4 1, PATTERN 5 2, PATTERN 6 2, PATTERN 7 1, SAME ORIENT AS W1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB-110328A, GRB110312A, GRB110709B ------------------------------------------------------------------------------------------------------------------------------------