13230( 6) - 25-Mar-2014 12:43:18 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 13230 Version: 6 Check-in Time: 25-Mar-2014 12:43:18 STScI Edit Number: 0 Title A supernova in the brightest gamma-ray burst ------------------------------------------------------------------------------------ Type Cycle GO/DD 20 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Andrew J. Levan The University of Warwick Y CoI: Prof. Nial R. Tanvir University of Leicester N CoI: Dr. Zach Cano University of Iceland N CoI: Prof. Jens Hjorth University of Copenhagen, Niels Bohr N Institute CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Dr. C. Kouveliotou NASA Marshall Space Flight Center N CoI: Dr. Stephen Bradley Cenko NASA Goddard Space Flight Center N CoI: Dr. Daniel Perley California Institute of Technology N CoI: Prof. Johan P. U. Fynbo University of Copenhagen, Niels Bohr N Institute CoI: Dr. Elena Pian INAF, Osservatorio Astronomico di Trieste N CoI: Dr. Asaf Pe'er Harvard University N CoI: Dr. Kuntal Misra Aryabhatta Research Institute of N Observational Sci CoI: Dr. Rebekah Hounsell Space Telescope Science Institute N CoI: Dr. John F. Graham The Johns Hopkins University N ------------------------------------------------------------------------------------ Abstract While the connection between long duration gamma-ray bursts and stripped envelope type Ic supernovae is relatively well established, the strong spectroscopic evidence on which it rests comes primarily from a handful of low-energy GRB/SNe. These are far from typical of the GRB population, and have been suggested to arise from rather different physical processes (such as shock breakout) than the bulk of the GRB population. Opportunities to study supernovae in much brighter bursts are hindered by the typical high redshift for the more luminous bursts, and the presence of bright afterglows from which the supernove must be separated. The very recent discovery of the brightest burst yet observed in 8 years of Swift observations -- GRB 130427A -- provides a unique opportunity to perform these studies on a burst of great astrophysical and public interest. The proximity of the burst (z=0.34) means that supernova studies are plausible, and here we propose to use HST to cleanly separate the afterglow, host galaxy and supernova components via UV and IR photometric observations, coupled with a optical grism spectrum. By isolating the supernova light from the afterglow, and using the unparalleled PSF of ACS to separate the host, we will uniquely identify the type and luminosity of the supernovae to a degree that will not be possible from the ground. In turn this will test if the supernovae in high-energy GRBs match those in their low energy cousisns, or if differing properties of the progenitor star can impact both GRB and supernova. ------------------------------------------------------------------------------------ Observations Description ------------------------ 13230( 6) - 25-Mar-2014 12:43:18 - [ 2] We plan to obtain two epochs of observations of GRB 130427A with WFC3 (UVIS and IR) and ACS (F606W and G800L). The aim of these observations is to follow the afterglow decay in the UV and IR and search for a supernova in the optical. For UVIS and IR channels on WFC3 we will conduct the observations with a three point dither obtaining both in a single orbit. For ACS we will use a 4-point dither (plus through image in F606W) to obtain the data. We ask for the first two visits to be scheduled as close in time as possible (+/- 24 hours) to enable simultaneous data so the afterglow can be subtracted accurately. Real Time Justification ----------------------- Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 13230( 6) - 25-Mar-2014 12:43:18 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB130427A GALAXY, HIGH REDSHIFT RA=11H32M32.8400S, J2000 V = 22 +/- 1 GALAXY DEC=+27D41'56.20" Reference Frame: Other: SDSS ------------------------------------------------------------------------------------------------------------------------------------ 13230( 6) - 25-Mar-2014 12:43:18 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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: 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 ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.265 Line_Spacing 0.187 Coordinate_Frame POS-TARG Pattern_Orient 20.67 Angle_Between_Sides 69.05 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 4 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 ------------------------------------------------------------------------------------------------------------------------------------ 13230( 6) - 25-Mar-2014 12:43:18 - [ 5] Visit: A1 Visit Requirements: ORIENT 134D TO 137 D; BEFORE 22-MAY-2013:00:00:00 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 GRB130427A ACS/WFC ACCUM WFC-FIX G800L 1 400 S POS TARG 75, -95; see below PATTERN 3 1 (1880 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 1 none none none 1 470.0 S GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 2 none none none 1 470.0 S GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 3 none none none 1 470.0 S GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 4 none none none 1 470.0 S 13230( 6) - 25-Mar-2014 12:43:18 - [ 6] Visit: A2 Visit Requirements: SAME ORIENT AS A1; AFTER A1 BY 300 D TO 400 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 GRB130427A ACS/WFC ACCUM WFC-FIX G800L 1 400 S POS TARG 75, -95; see below PATTERN 3 1 (1880 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 1 none none none 1 470.0 S GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 2 none none none 1 470.0 S GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 3 none none none 1 470.0 S GRB130427A 1 ACS/WFC ACCUM WFC-FIX G800L 4 none none none 1 470.0 S 13230( 6) - 25-Mar-2014 12:43:18 - [ 7] Visit: W1 Visit Requirements: BEFORE 22-MAY-2013:00:00:00 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 GRB130427A WFC3/UVI ACCUM UVIS2 F336W FLASH=10 1 500 S POS TARG -60, -30; S see below PATTERN 2 1 (1266 S) ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB130427A WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=12 1 DEF PATTERN 1 2 CUM (1047.699 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130427A 1 WFC3/UVI ACCUM UVIS2 F336W 1 none none none 1 422.0 S S GRB130427A 1 WFC3/UVI ACCUM UVIS2 F336W 2 none none none 1 422.0 S S GRB130427A 1 WFC3/UVI ACCUM UVIS2 F336W 3 none none none 1 422.0 S S GRB130427A 2 WFC3/IR MULTIAC IR F160W 1 none none none 1 N/A CUM GRB130427A 2 WFC3/IR MULTIAC IR F160W 2 none none none 1 N/A CUM GRB130427A 2 WFC3/IR MULTIAC IR F160W 3 none none none 1 N/A CUM 13230( 6) - 25-Mar-2014 12:43:18 - [ 8] Visit: W2 Visit Requirements: SAME ORIENT AS W1; AFTER A1 BY 300 D TO 400 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 GRB130427A WFC3/UVI ACCUM UVIS2 F336W FLASH=10 1 620 S POS TARG -60, -30; S see below PATTERN 4 1 (2508 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 | ------------------------------------------------------------------------------------------------------------------------------------ GRB130427A 1 WFC3/UVI ACCUM UVIS2 F336W 1 none none none 1 627.0 S S GRB130427A 1 WFC3/UVI ACCUM UVIS2 F336W 2 none none none 1 627.0 S S GRB130427A 1 WFC3/UVI ACCUM UVIS2 F336W 3 none none none 1 627.0 S S GRB130427A 1 WFC3/UVI ACCUM UVIS2 F336W 4 none none none 1 627.0 S S 13230( 6) - 25-Mar-2014 12:43:18 - [ 9] Summary Form for Proposal 13230 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2, WFC-FIX ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC, WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters FLASH=10, NSAMP=12, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER A1 BY 300 D TO 400 D, BEFORE 22-MAY-2013:00:00:00, ORIENT 134D TO 137 D, PATTERN 1 2, PATTERN 2 1, PATTERN 3 1, PATTERN 4 1, POS TARG -60, -30, POS TARG 75, -95, SAME ORIENT AS A1, SAME ORIENT AS W1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F336W, G800L ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB130427A ------------------------------------------------------------------------------------------------------------------------------------