12447( 5) - 26-Apr-2011 18:57:59 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 12447 Version: 5 Check-in Time: 26-Apr-2011 18:57:59 STScI Edit Number: 1 Title The Nature of the Remarkable Transient GRB 110328A ------------------------------------------------------------------------------------ Type Cycle GO/DD 18 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Andrew S. Fruchter Space Telescope Science Institute CoI: Dr. Stephen Bradley Cenko University of California - Berkeley N CoI: Dr. Joshua S. Bloom University of California - Berkeley N CoI: Mr. John Graham The Johns Hopkins University N CoI: Dr. Andrew J. Levan The University of Warwick N CoI: Dr. Kuntal Misra Space Telescope Science Institute N CoI: Mr. Daniel Perley California Institute of Technology N CoI: Dr. Nial R. Tanvir University of Leicester N CoI: Dr. Klaas Wiersema University of Leicester N ------------------------------------------------------------------------------------ Abstract One orbit was approved for GO/DD 12447. The PI was given permission to use time under his related approved GRB program, 12370, for subsequent observations of this GRB. To allow the second visit to go forward quickly, it was kept on the schedule as GO/DD 12447, but the orbit was charged to GO 12370. As a result, THE SECOND VISIT OF 12447 HAS THE PROPRIETARY PERIOD ASSOCIATED WITH 12370. We apologize for the confusion caused by this change. However, it was done to allow rapid observations of an unusual astrophysical object. We propose HST observations of the extraordinary transient, GRB 110328A. This object triggered the Swift automatic burst detection twice over the course of about ninety minutes, and has continued to be a bright X-ray source for the two days since. While this behavior might typically suggest a Galactic source, the high Galactic latitude of the object, and its coincidence with a star-forming galaxy at z=0.35 instead suggests a new type of extragalactic transient. WFC3 imaging in the optical and NIR will allow us to search for a varying point source to far greater depth than could be done from the ground, given the presence of an apparent host, and the use of the F160W filter may allow us to pierce enshrouding dust, if extinction is the reason for the present lack of a detection in the optical. While we do not yet know the astrophysical source of this transient, it appears unique among the hundreds of transients so far detected by Swift. This alone should provide strong grounds for HST observations of this unusual and potentially important object. ------------------------------------------------------------------------------------ Observations Description ------------------------ tbd Real Time Justification ----------------------- 12447( 5) - 26-Apr-2011 18:57:59 - [ 2] Calibration Justification ------------------------- Additional Comments ------------------- ------------------------------------------------------------------------------------ 12447( 5) - 26-Apr-2011 18:57:59 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 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. ------------------------------------------------------------------------------------------------------------------------------------ 12447( 5) - 26-Apr-2011 18:57:59 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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: 2 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-LINE Pattern_Purpose DITHER Number_Of_Points 2 Point_Spacing 1.908 Line_Spacing Coordinate_Frame POS-TARG Pattern_Orient 41.788 Angle_Between_Sides Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 3 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: 4 Primary_Pattern Secondary_Pattern Pattern_Type WFC3-IR-DITHER-BOX-MIN Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 1.716 Line_Spacing 1.095 Coordinate_Frame POS-TARG Pattern_Orient 18.528 Angle_Between_Sides 74.653 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 12447( 5) - 26-Apr-2011 18:57:59 - [ 5] Visit: 01 Visit Requirements: BEFORE 05-APR-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB-110328A WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=10 1 DEF PATTERN 4 1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB-110328A WFC3/UVI ACCUM UVIS2 F606W 1 420 S PATTERN 1 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 UVIS2 F606W 1 none none none 1 N/A S GRB-110328A 2 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB-110328A 2 WFC3/UVI ACCUM UVIS2 F606W 3 none none none 1 N/A S 12447( 5) - 26-Apr-2011 18:57:59 - [ 6] Visit: 02 Visit Requirements: SAME ORIENT AS 01; BETWEEN 20-APR-2011:00:00:00 AND 27-APR-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB-110328A WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=10 1 DEF PATTERN 4 1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB-110328A WFC3/UVI ACCUM UVIS2 F606W 1 420 S PATTERN 1 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 UVIS2 F606W 1 none none none 1 N/A S GRB-110328A 2 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB-110328A 2 WFC3/UVI ACCUM UVIS2 F606W 3 none none none 1 N/A S 12447( 5) - 26-Apr-2011 18:57:59 - [ 7] Visit: 03 Visit Requirements: BETWEEN 31-MAY-2011:00:00:00 AND 10-JUN-2011:00:00:00 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| | Requirements ------------------------------------------------------------------------------------------------------------------------------------ 1 GRB-110328A WFC3/IR MULTIAC IR F160W SAMP-SEQ=STEP50, NSAMP=10 1 DEF PATTERN 4 1 CUM ------------------------------------------------------------------------------------------------------------------------------------ 2 GRB-110328A WFC3/UVI ACCUM UVIS2 F606W 1 420 S PATTERN 1 2 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 | ------------------------------------------------------------------------------------------------------------------------------------ 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 UVIS2 F606W 1 none none none 1 N/A S GRB-110328A 2 WFC3/UVI ACCUM UVIS2 F606W 2 none none none 1 N/A S GRB-110328A 2 WFC3/UVI ACCUM UVIS2 F606W 3 none none none 1 N/A S 12447( 5) - 26-Apr-2011 18:57:59 - [ 8] Summary Form for Proposal 12447 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR, UVIS2 ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR, WFC3/UVIS ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM, MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=10, SAMP-SEQ=STEP50 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BEFORE 05-APR-2011:00:00:00, BETWEEN 20-APR-2011:00:00:00 AND 27-APR-2011:00:00:00, BETWEEN 31-MAY-2011:00:00:00 AND 10-JUN-2011:00:00:00, PATTERN 1 2, PATTERN 4 1, SAME ORIENT AS 01 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F160W, F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GRB-110328A ------------------------------------------------------------------------------------------------------------------------------------