13949( 5) - 28-Sep-2015 17:30:40 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13949 Version: 5 Check-in Time: 28-Sep-2015 17:30:40 STScI Edit Number: 0 Title A Chandra/HST survey of dark gamma-ray bursts ------------------------------------------------------------------------------------ Type Cycle GO 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Andrew J. Levan The University of Warwick Y CoI: Prof. Nial R. Tanvir University of Leicester N CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Dr. Daniel Perley University of Copenhagen, Niels Bohr N Institute CoI: Prof. Jens Hjorth University of Copenhagen, Niels Bohr N Institute CoI: Dr. Paul T. O'Brien University of Leicester N ------------------------------------------------------------------------------------ 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 continue 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 observe HST observations to identify and study the host galaxies of dark GRBs. These bursts will have sub-arcsecond positions from our Chandra observations, and we will use HST to identify the hosts and study their luminosities and morphologies. In some cases nothing will be known about the host galaxies prior to the observations, in others they may have been identified in ground based imaging. For each host galaxy we will obtain F606W and F160W observations, but may vary the exposure time depending on the information available at the time. For this reason we have included two strategies, the first utilizes F606W and F160W observations within a single orbit with WFC3 (3-point line dithers in each case). The second splits the F606W and F160W observations between 2-orbits, using ACS/WFC3 for the first orbit and WFC3/IR for the second. In each case we will use a 4-point dither within the orbit. We have utlized the WFC-CTE aperture for the ACS observations to minimize the impact of CTE. On triggering we will also include a POS-TARG offset for the UVIS observations to place the targets close to the corner of the chip (the precise pos-targs, choice of chip may need to be determined by availablility of 13949( 5) - 28-Sep-2015 17:30:40 - [ 2] guide stars etc). ------------------------------------------------------------------------------------ 13949( 5) - 28-Sep-2015 17:30:40 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 4 GRB141031A GALAXY, HIGH REDSHIFT RA=08H34M26.0880S, J2000 V = 25 +/- 1 GALAXY, STAR FORMING DEC=-59D10'5.79" REGION, STARBURST Reference Frame: Other: Chandra ------------------------------------------------------------------------------------------------------------------------------------ 5 GRB111005A GALAXY, SPIRAL RA=14H53M7.8000S, J2000 V = 15 DEC=-19D44'12.00" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 6 GRB140331A GALAXY, STAR FORMING RA=08H59M27.4600S, J2000 V = 22 +/- 1 REGION, STARBURST DEC=+02D43'2.30" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 7 GRB150616A GALAXY, STAR FORMING RA=20H58M52.0200S, J2000 V = 23 +/- 1 REGION, STARBURST DEC=-53D23'38.00" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 13949( 5) - 28-Sep-2015 17:30:40 - [ 4] TARGET LIST Generic Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Selection Criteria | Flux data No | Name | Description | | ------------------------------------------------------------------------------------------------------------------------------------ 3 DARK-GRB3 GALAXY, STAR FORMING AWAITING GRB TRIGGER V = 25 +/- 1 REGION, STARBURST ------------------------------------------------------------------------------------------------------------------------------------ 13949( 5) - 28-Sep-2015 17:30:40 - [ 5] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 2 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 ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 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: 4 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: 5 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 ------------------------------------------------------------------------------------------------------------------------------------ 13949( 5) - 28-Sep-2015 17:30:40 - [ 6] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 6 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-UVIS-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.145 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 46.84 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 7 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 0.636 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 13949( 5) - 28-Sep-2015 17:30:40 - [ 7] Visit: 01 Visit Requirements: ORIENT 28D TO 78 D; ORIENT 118D TO 168 D; ORIENT 208D TO 258 D; ORIENT 298D TO 348 D; BEFORE 30-JAN-2015:00:00:00 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 GRB141031A WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF PATTERN 4 1 CUM (1208.808 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB141031A WFC3/UVI ACCUM UVIS F606W 1 375 S POS TARG -61, -77; S see below PATTERN 2 2 (1395 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB141031A 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB141031A 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB141031A 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB141031A 2 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 465.0 S S GRB141031A 2 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 465.0 S S GRB141031A 2 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 465.0 S S 13949( 5) - 28-Sep-2015 17:30:40 - [ 8] 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 GRB140331A WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF PATTERN 4 1 CUM (1208.808 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB140331A WFC3/UVI ACCUM UVIS F606W 1 375 S POS TARG -61, -77; S see below PATTERN 2 2 (1137 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB140331A 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB140331A 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB140331A 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB140331A 2 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 379.0 S S GRB140331A 2 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 379.0 S S GRB140331A 2 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 379.0 S S 13949( 5) - 28-Sep-2015 17:30:40 - [ 9] Visit: 03 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 GRB150616A WFC3/IR MULTIAC IR F160W NSAMP=9, SAMP-SEQ=SPARS50 1 DEF PATTERN 4 1 CUM (1208.808 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB150616A WFC3/UVI ACCUM UVIS F606W 1 375 S POS TARG -61, -77; S see below PATTERN 2 2 (1329 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB150616A 1 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB150616A 1 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB150616A 1 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM GRB150616A 2 WFC3/UVI ACCUM UVIS F606W 1 none none none 1 443.0 S S GRB150616A 2 WFC3/UVI ACCUM UVIS F606W 2 none none none 1 443.0 S S GRB150616A 2 WFC3/UVI ACCUM UVIS F606W 3 none none none 1 443.0 S S 13949( 5) - 28-Sep-2015 17:30:40 - [ 10] Visit: 04 Visit Requirements: ON HOLD On Hold Comments: Awaiting GRB positio 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 DARK-GRB3 WFC3/IR MULTIAC IR F160W NSAMP=8, SAMP-SEQ=STEP100 1 DEF CUM (199.231 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 DARK-GRB3 WFC3/IR MULTIAC IR F160W NSAMP=12, SAMP-SEQ=STEP100 1 DEF PATTERN 3 2 CUM (2396.929 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 | ------------------------------------------------------------------------------------------------------------------------------------ DARK-GRB3 1 WFC3/IR MULTIAC IR F160W none none none none 1 N/A CUM DARK-GRB3 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM DARK-GRB3 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM DARK-GRB3 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM DARK-GRB3 2 WFC3/IR MULTIAC IR F160W 4 none none none 1 N/A CUM 13949( 5) - 28-Sep-2015 17:30:40 - [ 11] Visit: 05 Visit Requirements: ORIENT 357D TO 23 D; ORIENT 127D TO 157 D; ORIENT 177D TO 208 D; ORIENT 313D TO 337 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 GRB111005A WFC3/UVI ACCUM UVIS2 F606W 1 348 S POS TARG 0, 0; PATTERN 6 S see below 1 (686 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB111005A WFC3/UVI ACCUM UVIS2 F438W FLASH=10 1 348 S POS TARG 0, 0; PATTERN 5 S (1044 S) 2 ------------------------------------------------------------------------------------------------------------------------------------ 3 GRB111005A WFC3/IR MULTIAC IR F160W NSAMP=4, SAMP-SEQ=SPARS50 1 DEF PATTERN 7 3 CUM (305.867 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB111005A 1 WFC3/UVI ACCUM UVIS2 F606W 1 none none none 1 338.0 S S GRB111005A 1 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB111005A 2 WFC3/UVI ACCUM UVIS2 F438W 1 none none none 1 N/A S GRB111005A 2 WFC3/UVI ACCUM UVIS2 F438W 2 none none none 1 N/A S GRB111005A 2 WFC3/UVI ACCUM UVIS2 F438W 3 none none none 1 N/A S GRB111005A 3 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB111005A 3 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM 13949( 5) - 28-Sep-2015 17:30:40 - [ 12] Summary Form for Proposal 13949 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, NSAMP=12, NSAMP=4, NSAMP=8, NSAMP=9, SAMP-SEQ=SPARS50, SAMP-SEQ=STEP100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 30-JAN-2015:00:00:00, ON HOLD , ORIENT 118D TO 168 D, ORIENT 127D TO 157 D, ORIENT 177D TO 208 D, ORIENT 208D TO 258 D, ORIENT 28D TO 78 D, ORIENT 298D TO 348 D, ORIENT 313D TO 337 D, ORIENT 357D TO 23 D, PATTERN 2 2, PATTERN 3 2, PATTERN 4 1, PATTERN 5 2, PATTERN 6 1, PATTERN 7 3, POS TARG -61, -77, POS TARG 0, 0 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F438W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names DARK-GRB3, GRB111005A, GRB140331A, GRB141031A, GRB150616A ------------------------------------------------------------------------------------------------------------------------------------