14850( 8) - 06-Dec-2018 16:54:11 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14850 Version: 8 Check-in Time: 06-Dec-2018 16:54:11 STScI Edit Number: 4 Title Identify the signature of neutron star mergers through rapid Chandra/Hubble observations of a short GRB ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Eleonora Troja University of Maryland Y CoI: Dr. Stephen Bradley Cenko NASA Goddard Space Flight Center Y CoI: Dr. Neil Gehrels NASA Goddard Space Flight Center N CoI: Nobuyuki Kawai Tokyo Institute of Technology - TIT N CoI: Dr. Amy Lien NASA Goddard Space Flight Center N CoI: Dr. Taka Sakamoto Aoyama Gakuin University N ------------------------------------------------------------------------------------ Abstract The afterglow of some short GRBs displays a late-time rebrightening, visible a few days after the gamma-ray burst. Recent HST observations provided tantalizing evidence that such late-time bump could be explained as the emergence of the underlying kilonova emission. This would represent the incontrovertible signature of a neutron star merger, and the first direct link between short GRBs and their progenitors. Here we ask for a rapid and deep Chandra/HST follow-up observation of a short duration GRB in order to detect the expected kilonova bump, and to constrain the origin of the observed emission. Multi-band observations, and in particular X-rays, are critical to pin down the nature of the observed rebrightening, and to distinguish it from the standard afterglow emission. ------------------------------------------------------------------------------------ Observations Description ------------------------ Below we provide an illustrative description of our observational strategy. Given the broad range of short GRB redshifts, afterglow and host properties, the exact details of the observations (response time, cadence, and filters) will be determined on a case by case basis. We request three epochs of observations, the exact times will be scaled according to the observed afterglow decay, the GRB distance scale, and the total time span of the ground-based data. We will plan our observations in order to require a reaction time >2 days. Each epoch will consist of three orbits in order to image the target in different colors. In case of a rare nearby z~0.1 event we may request to perform spectroscopic observations. We remark that the choice of UVIS and IR filters reported in this observing form is preliminary, and the final selection will be made at the time of the ToO in order to match the best sampled light curves from the ground. ------------------------------------------------------------------------------------ 14850( 8) - 06-Dec-2018 16:54:11 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SHORT-GRB EXT-STAR, GAMMA RAY RA=13H09M48.0900S +/- 2", J2000 V = 18.5 BURSTER DEC=-23D22'53.35" +/- 2" Reference Frame: Other: optical Extended: NO ------------------------------------------------------------------------------------------------------------------------------------ 14850( 8) - 06-Dec-2018 16:54:11 - [ 3] 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 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 ------------------------------------------------------------------------------------------------------------------------------------ 14850( 8) - 06-Dec-2018 16:54:11 - [ 4] Visit: 01 (VISIT1) Visit Requirements: SCHED 100%; ON HOLD ; TOO RESPONSE TIME 3.0D On Hold Comments: ToO Activation 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 SHORT-GRB WFC3/UVI ACCUM UVIS2-C1K F606W CR-SPLIT=NO, FLASH=9 1 90 S PATTERN 1 1 S 1C-SUB see below (452 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SHORT-GRB WFC3/UVI ACCUM UVIS2-C1K F475W CR-SPLIT=NO 1 130 S (520 PATTERN 1 2 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SHORT-GRB WFC3/UVI ACCUM UVIS2-C1K F275W 1 155 S (620 PATTERN 1 3 S 1C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 1 none none none 1 113.0 S S K1C-SUB SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 2 none none none 1 113.0 S S K1C-SUB SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 3 none none none 1 113.0 S S K1C-SUB SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 4 none none none 1 113.0 S S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 1 none none none 1 N/A S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 2 none none none 1 N/A S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 3 none none none 1 N/A S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 4 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 1 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 2 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 3 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 4 none none none 1 N/A S K1C-SUB 14850( 8) - 06-Dec-2018 16:54:11 - [ 5] Visit: 02 (VISIT_IR) Visit Requirements: SCHED 100%; ON HOLD ; TOO RESPONSE TIME 3.0D On Hold Comments: ToO Activation 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 SHORT-GRB WFC3/IR MULTIAC IR F110W NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 3 1 CUM (1205.875 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SHORT-GRB WFC3/IR MULTIAC IR F160W NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 3 2 CUM (1205.875 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 | ------------------------------------------------------------------------------------------------------------------------------------ SHORT-GRB 1 WFC3/IR MULTIAC IR F110W 1 none none none 1 N/A CUM SHORT-GRB 1 WFC3/IR MULTIAC IR F110W 2 none none none 1 N/A CUM SHORT-GRB 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM SHORT-GRB 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM 14850( 8) - 06-Dec-2018 16:54:11 - [ 6] Visit: 03 (VISIT_IR) Visit Requirements: SCHED 100%; ON HOLD ; TOO RESPONSE TIME 3.0D On Hold Comments: ToO Activation 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 SHORT-GRB WFC3/IR MULTIAC GRISM1024 G102 NSAMP=13, SAMP-SEQ=SPARS50 1 DEF PATTERN 3 1-2 CUM (1205.875 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SHORT-GRB WFC3/IR MULTIAC GRISM1024 G141 NSAMP=13, SAMP-SEQ=SPARS50 1 DEF CUM (1205.875 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 | ------------------------------------------------------------------------------------------------------------------------------------ SHORT-GRB 1 WFC3/IR MULTIAC GRISM102 G102 1 none none none 1 N/A CUM 4 SHORT-GRB 1 WFC3/IR MULTIAC GRISM102 G102 2 none none none 1 N/A CUM 4 SHORT-GRB 2 WFC3/IR MULTIAC GRISM102 G141 1 none none none 1 N/A CUM 4 SHORT-GRB 2 WFC3/IR MULTIAC GRISM102 G141 2 none none none 1 N/A CUM 4 14850( 8) - 06-Dec-2018 16:54:11 - [ 7] Visit: 04 (VISIT1B) Visit Requirements: SCHED 100%; ON HOLD ; TOO RESPONSE TIME 3.0D On Hold Comments: ToO Activation 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 SHORT-GRB WFC3/UVI ACCUM UVIS2-C1K F606W CR-SPLIT=NO, FLASH=10 1 90 S PATTERN 1 1 S 1C-SUB see below (408 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 SHORT-GRB WFC3/UVI ACCUM UVIS2-C1K F475W CR-SPLIT=NO, FLASH=12 1 130 S (520 PATTERN 1 2 S 1C-SUB S) ------------------------------------------------------------------------------------------------------------------------------------ 3 SHORT-GRB WFC3/UVI ACCUM UVIS2-C1K F275W FLASH=14, CR-SPLIT=NO 1 155 S (620 PATTERN 1 3 S 1C-SUB 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 | ------------------------------------------------------------------------------------------------------------------------------------ SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 1 none none none 1 102.0 S S K1C-SUB SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 2 none none none 1 102.0 S S K1C-SUB SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 3 none none none 1 102.0 S S K1C-SUB SHORT-GRB 1 WFC3/UVI ACCUM UVIS2-C1 F606W 4 none none none 1 102.0 S S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 1 none none none 1 N/A S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 2 none none none 1 N/A S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 3 none none none 1 N/A S K1C-SUB SHORT-GRB 2 WFC3/UVI ACCUM UVIS2-C1 F475W 4 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 1 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 2 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 3 none none none 1 N/A S K1C-SUB SHORT-GRB 3 WFC3/UVI ACCUM UVIS2-C1 F275W 4 none none none 1 N/A S K1C-SUB 14850( 8) - 06-Dec-2018 16:54:11 - [ 8] Summary Form for Proposal 14850 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures GRISM1024, IR, UVIS2-C1K1C-SUB ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters CR-SPLIT=NO, FLASH=10, FLASH=12, FLASH=14, FLASH=9, NSAMP=13, SAMP-SEQ=SPARS50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ON HOLD , PATTERN 1 1, PATTERN 1 2, PATTERN 1 3, PATTERN 3 1, PATTERN 3 1-2, PATTERN 3 2, SCHED 100%, TOO RESPONSE TIME 3.0D ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F110W, F160W, F275W, F475W, F606W, G102, G141 ------------------------------------------------------------------------------------------------------------------------------------ Target Names SHORT-GRB ------------------------------------------------------------------------------------------------------------------------------------