14055( 3) - 29-Jul-2015 17:33:15 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14055 Version: 3 Check-in Time: 29-Jul-2015 17:33:15 STScI Edit Number: 0 Title HST NIR observations of the currently active magnetar SGR 1935+2154 ------------------------------------------------------------------------------------ Type Cycle GO/DD 22 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Andrew J. Levan The University of Warwick Y CoI: Dr. C. Kouveliotou George Washington University N CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N ------------------------------------------------------------------------------------ Abstract The newly discovered (2014, July 5) magnetar SGR 1935+2154 entered a burst active phase on 2015 February 22 and has been detected to emit at least 6 bursts in the last 48 hours. Very few magnetars have been detected in wavelengths other than X-rays, mostly because there is typically a large extinction along the line of sight. This particular source, however, is located in an uncrowded field with very low extinction and has therefore an excellent chance to be detected with the superb capabilities of HST. Such a detection would provide, besides a very accurate location, an unambiguous IR counterpart via photometric variability and establish the putative association of the source with a supernova remnant. A detection would also allow the determination (with future observations) of the proper motion of the source and thereby an estimate of the natal kick of the source. The proposed observations are likely to be extremely valuable for understanding the nature of these rare objects and their progenitors. ------------------------------------------------------------------------------------ Observations Description ------------------------ We wish to obtain deep IR observations of the currently active magnetar SGR 1935+2154. We will use a single orbit of F140W observations and a standard 4-point dither to reach depths of AB~28 (3-sigma). We will repeat this observation ~6 months later (with the PA of the observation rotated by 180 degrees) in order perform a subtraction and search for variability in the sources within the X-ray error circle. ------------------------------------------------------------------------------------ 14055( 3) - 29-Jul-2015 17:33:15 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 SGR1935+2154 STAR, NEUTRON STAR RA=19H34M55.6800S, J2000 V = 25 +/- 5 DEC=+21D53'48.20" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14055( 3) - 29-Jul-2015 17:33:15 - [ 3] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 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 ------------------------------------------------------------------------------------------------------------------------------------ 14055( 3) - 29-Jul-2015 17:33:15 - [ 4] Visit: 01 Visit Requirements: ORIENT 75D TO 125 D; ORIENT 165D TO 215 D; ORIENT 255D TO 305 D; ORIENT 345D TO 35 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 SGR1935+215 WFC3/IR MULTIAC IR F140W NSAMP=12, SAMP-SEQ=STEP100 1 DEF PATTERN 1 1 4 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 | ------------------------------------------------------------------------------------------------------------------------------------ SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 1 none none none 1 N/A CUM SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 2 none none none 1 N/A CUM SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 3 none none none 1 N/A CUM SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 4 none none none 1 N/A CUM 14055( 3) - 29-Jul-2015 17:33:15 - [ 5] Visit: 02 Visit Requirements: ORIENT 180D TO 180D FROM 01 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 SGR1935+215 WFC3/IR MULTIAC IR F140W NSAMP=12, SAMP-SEQ=STEP100 1 DEF PATTERN 1 1 4 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 | ------------------------------------------------------------------------------------------------------------------------------------ SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 1 none none none 1 N/A CUM SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 2 none none none 1 N/A CUM SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 3 none none none 1 N/A CUM SGR1935+2154 1 WFC3/IR MULTIAC IR F140W 4 none none none 1 N/A CUM 14055( 3) - 29-Jul-2015 17:33:15 - [ 6] Summary Form for Proposal 14055 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, SAMP-SEQ=STEP100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ORIENT 165D TO 215 D, ORIENT 180D TO 180D FROM 01, ORIENT 255D TO 305 D, ORIENT 345D TO 35 D, ORIENT 75D TO 125 D, PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140W ------------------------------------------------------------------------------------------------------------------------------------ Target Names SGR1935+2154 ------------------------------------------------------------------------------------------------------------------------------------