12764( 9) - 17-Apr-2013 15:17:04 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12764 Version: 9 Check-in Time: 17-Apr-2013 15:17:04 STScI Edit Number: 0 Title The demographics of dark gamma-ray bursts ------------------------------------------------------------------------------------ Type Cycle GO 19 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Andrew J. Levan The University of Warwick Y 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. Daniel Perley California Institute of Technology 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 most dark GRBs originating in more luminous galaxies than "bright" GRBs. Our new observations will increase the statistical certainty of this result, while simultaneously allowing us to more precisely identify the minority of dark GRBs which most likely originate from the highest redshifts. ------------------------------------------------------------------------------------ Observations Description ------------------------ We propose to obtain HST optical and IR observations of a sample of dark gamma-ray bursts (bursts whose optical afterglows were apparently suppressed). We will adopt a strategy depending on the available information on the host galaxy at the time of trigger. If ground based optical observations have located a candidate host we will obtain observations in a single orbit, split between F606W and F160W (visits D1 and D2). If no host galaxy is visible to deep limits we will use single orbit observations in each filter (visit H1, H2 and V1, V2). For our single orbit, single filter visits we will use the default 4 point dither patterns, with the target placed at the default aimpoints on both UVIS and IR chips. Because of buffer dump issues we cannot obtain 8 exposures within a single orbit, and hence for visits D1 and D2 we use a 3 point line dither, which allows for good CR rejection, and a degree of psf recovery. Real Time Justification 12764( 9) - 17-Apr-2013 15:17:04 - [ 2] ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12764( 9) - 17-Apr-2013 15:17:04 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 GRB110915A GALAXY, HIGH REDSHIFT RA=20H43M17.8900S +/- 0.1", J2000 V = 27 +/- 2 GALAXY DEC=-00D43'23.60" +/- 0.1" Reference Frame: Other: Chandra ------------------------------------------------------------------------------------------------------------------------------------ 5 GRB110328A GALAXY, ACCRETION DISK, RA=16H44M49.8700S +/- 0.1", J2000 V = 23 +/- 0.5 HIGH REDSHIFT GALAXY DEC=+57D35'0.20" +/- 0.1" Reference Frame: Other: Swift ------------------------------------------------------------------------------------------------------------------------------------ 6 GRB111215A GALAXY, HIGH REDSHIFT RA=23H18M13.3200S +/- 0.1", J2000 V = 24 +/- 1 GALAXY DEC=+32D29'38.40" +/- 0.1" Reference Frame: Other: Swift ------------------------------------------------------------------------------------------------------------------------------------ 7 GRB120320A GALAXY, HIGH REDSHIFT RA=14H10M4.2200S +/- 0.1", J2000 V = 23 +/- 1 GALAXY DEC=+08D41'47.20" +/- 0.1" Reference Frame: Other: Swift ------------------------------------------------------------------------------------------------------------------------------------ 12764( 9) - 17-Apr-2013 15:17:04 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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: 2 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: 3 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.605 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE-3PT Pattern_Purpose DITHER Number_Of_Points 3 Point_Spacing 0.135 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12764( 9) - 17-Apr-2013 15:17:04 - [ 5] Visit: D1 Visit Requirements: ORIENT 65D TO 95 D; ORIENT 245D TO 280 D; ORIENT 310D TO 16 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB111215A WFC3/UVI ACCUM UVIS2 F606W CR-SPLIT=NO 1 370 S PATTERN 4 1 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB111215A WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF PATTERN 3 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB111215A 1 WFC3/UVI ACCUM UVIS2 F606W 1 none none none 1 N/A S GRB111215A 1 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB111215A 1 WFC3/UVI ACCUM UVIS2 F606W 3 none none none 1 N/A S GRB111215A 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB111215A 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB111215A 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM 12764( 9) - 17-Apr-2013 15:17:04 - [ 6] Visit: D2 Visit Requirements: ORIENT 20D TO 90 D; ORIENT 110D TO 180 D; ORIENT 200D TO 270 D; ORIENT 290D TO 0 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB120320A WFC3/UVI ACCUM UVIS F606W CR-SPLIT=NO 1 370 S PATTERN 4 1 S ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB120320A WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF PATTERN 3 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB120320A 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 N/A S GRB120320A 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 N/A S GRB120320A 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 N/A S GRB120320A 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB120320A 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB120320A 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM 12764( 9) - 17-Apr-2013 15:17:04 - [ 7] Visit: H1 Visit Requirements: On Hold Comments: Additional Comments: F160W, 1 orbit, 4 point dither Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB110915A WFC3/IR MULTIAC IR F160W NSAMP=14, SAMP-SEQ=SPARS50 1 DEF PATTERN 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB110915A 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB110915A 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB110915A 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB110915A 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 12764( 9) - 17-Apr-2013 15:17:04 - [ 8] Visit: H2 Visit Requirements: ORIENT 237D TO 237 D On Hold Comments: Additional Comments: F160W, 1 orbit, 4 point dither Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB110328A WFC3/IR MULTIAC IR F160W NSAMP=8, SAMP-SEQ=SPARS100 1 DEF GS ACQ SCENARIO BASE1B3; CUM 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB110328A 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB110328A 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB110328A 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB110328A 1 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 12764( 9) - 17-Apr-2013 15:17:04 - [ 9] Visit: V1 Visit Requirements: On Hold Comments: Additional Comments: F606W, 1 orbit, 4 point dither Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB110915A WFC3/UVI ACCUM UVIS F606W 1 500 S PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB110915A 1 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 627.0 S S GRB110915A 1 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 627.0 S S GRB110915A 1 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 627.0 S S GRB110915A 1 WFC3/UVI ACCUM UVIS F606W 4 none none none 1 627.0 S S 12764( 9) - 17-Apr-2013 15:17:04 - [ 10] Visit: V2 Visit Requirements: SAME ORIENT AS H2; ON HOLD On Hold Comments: Awaiting GRB trigger Additional Comments: F606W, 1 orbit, 4 point dither Exposures ------------------------------------------------------------------------------------------------------------------------------------ Exp | Target | Instr | Oper. | Aper |Spectral|Central| Optional |Num| Time | Special Num | Name | Config | Mode | or FOV |Element |Waveln.| Parameters |Exp| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB110328A WFC3/UVI ACCUM UVIS2 F606W 1 650 S PATTERN 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB110328A 1 WFC3/UVI ACCUM UVIS2 F606W 1 none none none 1 N/A S GRB110328A 1 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB110328A 1 WFC3/UVI ACCUM UVIS2 F606W 3 none none none 1 N/A S GRB110328A 1 WFC3/UVI ACCUM UVIS2 F606W 4 none none none 1 N/A S 12764( 9) - 17-Apr-2013 15:17:04 - [ 11] Summary Form for Proposal 12764 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, NSAMP=14, NSAMP=8, NSAMP=9, SAMP-SEQ=SPARS100, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements GS ACQ SCENARIO BASE1B3, ON HOLD , ORIENT 110D TO 180 D, ORIENT 200D TO 270 D, ORIENT 20D TO 90 D, ORIENT 237D TO 237 D, ORIENT 245D TO 280 D, ORIENT 290D TO 0 D, ORIENT 310D TO 16 D, ORIENT 65D TO 95 D, PATTERN 1 1, PATTERN 2 1, PATTERN 3 2, PATTERN 4 1, SAME ORIENT AS H2 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB110328A, GRB110915A, GRB111215A, GRB120320A ------------------------------------------------------------------------------------------------------------------------------------