14805( 4) - 02-Oct-2017 15:58:22 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14805 Version: 4 Check-in Time: 02-Oct-2017 15:58:22 STScI Edit Number: 0 Title A rapid search for the counterpart to an active magnetar ------------------------------------------------------------------------------------ Type Cycle GO 24 ------------------------------------------------------------------------------------ Investigators Contact? PI: Prof. Andrew James Levan The University of Warwick Y CoI: Dr. Andrew S. Fruchter Space Telescope Science Institute N CoI: Dr. C. Kouveliotou George Washington University N ------------------------------------------------------------------------------------ Abstract We propose to obtain a fast response observation of a magnetar undergoing an active period. Utilizing rapid, deep, diffraction limited observations with WFC3 we will maximize the chances of obtaining the IR detection of the magnetar. This in turn yields unique constraints on emission mechanisms, enables the measurement of dynamics (e.g. via proper motion) and can associate the magnetar with a given structure (e.g. young cluster or supernova remnant) in the galaxy. The association with a cluster provides means of measuring the stellar age, in turn informing the stellar properties (e.g. mass) of the magnetar progenitors. We have demonstrated the success of this approach with the detection of the counterpart of SGR 1935+2154 with a magnitude (during bursting activity) of F140W(AB)~25.5, a level extremely challenging to detect variability in from the ground, requiring multiple nights of adaptive optics imaging in typical conditions. Indeed, our observations will be senstive to counterparts significantly fainter than it is possible to detect from any ground based observatory. These observations will allow us to break through the observational barrier that has so far prevented us from detecting counterparts to more than two-thirds of magnetar candidates. With these observations we will construct a fuller picture of magnetars, the routes to their creation, and their role as cosmic engines across the Universe. ------------------------------------------------------------------------------------ Observations Description ------------------------ This proposal is for rapid ToO observations of an active magnetar. The set-up is relatively simple. We will obtain deep F140W observations of one orbit duration, with two epochs separated by >6 months to search for variability. At each epoch we will obtain an identical sequence of 4x600s F140W observations with a standard 4-point dither pattern. We will time our second epoch such that the observations take place at a roll angle 0, 90, 180, 270 from the initial observations so that diffraction spikes in crowded fields overlay eachother. ------------------------------------------------------------------------------------ 14805( 4) - 02-Oct-2017 15:58:22 - [ 2] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 2 CXOJ164710 EXT-STAR, PULSAR RA=16H47M10.1550S, J2000 V = 30 +/- 5 DEC=-45D52'16.43" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14805( 4) - 02-Oct-2017 15:58:22 - [ 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 ------------------------------------------------------------------------------------------------------------------------------------ 14805( 4) - 02-Oct-2017 15:58:22 - [ 4] Visit: 01 Visit Requirements: SCHED 100%; ORIENT 342D TO 348 D; ON HOLD On Hold Comments: Awaiting SGRB trigger 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 CXOJ164710 WFC3/IR MULTIAC IR F140W SAMP-SEQ=STEP100, NSAMP=12 1 DEF PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ CXOJ164710 1 WFC3/IR MULTIAC IR F140W 1 none none none 1 N/A CUM CXOJ164710 1 WFC3/IR MULTIAC IR F140W 2 none none none 1 N/A CUM CXOJ164710 1 WFC3/IR MULTIAC IR F140W 3 none none none 1 N/A CUM CXOJ164710 1 WFC3/IR MULTIAC IR F140W 4 none none none 1 N/A CUM 14805( 4) - 02-Oct-2017 15:58:22 - [ 5] Visit: 02 Visit Requirements: SCHED 100%; SAME ORIENT AS 01; ON HOLD On Hold Comments: Awaiting SGRB trigger 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 CXOJ164710 WFC3/IR MULTIAC IR F140W SAMP-SEQ=STEP100, NSAMP=12 1 DEF PATTERN 1 1 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 | ------------------------------------------------------------------------------------------------------------------------------------ CXOJ164710 1 WFC3/IR MULTIAC IR F140W 1 none none none 1 N/A CUM CXOJ164710 1 WFC3/IR MULTIAC IR F140W 2 none none none 1 N/A CUM CXOJ164710 1 WFC3/IR MULTIAC IR F140W 3 none none none 1 N/A CUM CXOJ164710 1 WFC3/IR MULTIAC IR F140W 4 none none none 1 N/A CUM 14805( 4) - 02-Oct-2017 15:58:22 - [ 6] Summary Form for Proposal 14805 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures IR ------------------------------------------------------------------------------------------------------------------------------------ Configurations WFC3/IR ------------------------------------------------------------------------------------------------------------------------------------ Opmodes MULTIACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters NSAMP=12, SAMP-SEQ=STEP100 ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements ON HOLD , ORIENT 342D TO 348 D, PATTERN 1 1, SAME ORIENT AS 01, SCHED 100% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F140W ------------------------------------------------------------------------------------------------------------------------------------ Target Names CXOJ164710 ------------------------------------------------------------------------------------------------------------------------------------