15606( 8) - 18-Feb-2019 21:34:39 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 15606 Version: 8 Check-in Time: 18-Feb-2019 21:34:39 STScI Edit Number: 3 Title Late-time monitoring of GW170817 across the electromagnetic spectrum ------------------------------------------------------------------------------------ Type Cycle GO 26 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Raffaella Margutti Northwestern University Y CoI: Dr. Wen-fai Fong Northwestern University Y CoI: Prof. Edo Berger Harvard University N CoI: Dr. Lorenzo Sironi Columbia University in the City of New N York CoI: Dr. Cristiano Guidorzi University of Ferrara N CoI: Prof. Brian Metzger Columbia University in the City of New N York CoI: Dr. Kate Denham Alexander Northwestern University N CoI: Dr. Andrew MacFadyen New York University N CoI: Prof. Ryan Chornock Ohio University N CoI: Dr. D Giannios Purdue University N CoI: Dr. Deanne Coppejans Northwestern University N CoI: Giacomo Terreran Northwestern University N CoI: Dr. Aprajita Hajela Northwestern University N CoI: Ms. xiaoyi xie Polar Research Institute of China (PRIC) N CoI: Dr. Adithan Kathirgamaraju Purdue University N CoI: Dr. K Paterson University of South Africa N CoI: Mr. Peter Blanchard Harvard University N CoI: Mr. Philip Cowperthwaite Carnegie Institution of Washington N CoI: Dr. Tarraneh Eftekhari Smithsonian Institution Astrophysical N Observatory CoI: Matt Nicholl Royal Observatory Edinburgh N CoI: Ms. Ashley Villar Harvard University N CoI: Dr. Peter K. G. Williams Harvard University N CoI: Dr. Jonathan Zrake Columbia University in the City of New N York ------------------------------------------------------------------------------------ Abstract The co-PIs of this proposal are Wen-fai Fong and Raffaella Margutti. We propose joint Chandra-VLA-HST observations to continue our monitoring of the binary neutron star merger GW170817 at t~500-850 days since merger. Our immediate objectives are: (i) to constrain the broad-band spectral evolution of the non-thermal emission from GW170817, and, in particular, the passage of the synchrotron cooling frequency within the Chandra bandpass; (ii) to map the temporal evolution of the emission from GW170817 across the electromagnetic spectrum. These observations are designed to provide new insight into the current debate about the nature of the relativistic ejecta of compact- object mergers and their (now questioned) capability to successfully launch ultra-relativistic jets in their environment. ------------------------------------------------------------------------------------ Observations Description 15606( 8) - 18-Feb-2019 21:34:39 - [ 2] ------------------------ This proposal is for 2 3-orbit visits of the optical counterpart of GW170817 with HST/ACS F606W. These observations are through our approved Chandra Cycle 20 program. Since the counterpart is expected to be extremely faint (>27 AB mag), we ask that the 2 3-orbit visits occur within a 20 days of each other so in the event of non-detection, we can stack all of the images together and have a deep, unprecedented limit at the position. We also ask that observations commence between Jan 1, 2019-Aug 30, 2019 to roughly coincide with our Chandra observations of the source. Earlier times in this range are strongly preferred. We note that GW170817 is a point source on the outskirts of NGC4993, a bright S0 galaxy. ------------------------------------------------------------------------------------ 15606( 8) - 18-Feb-2019 21:34:39 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 GW170817 EXT-STAR, GAMMA RAY RA=13H09M48.0900S, J2000 V = 27 BURSTER DEC=-23D22'53.35" Reference Frame: Other: SIMBAD Extended: NO Comments: This object was generated by the targetselector and retrieved from the SIMBAD database. ------------------------------------------------------------------------------------------------------------------------------------ 15606( 8) - 18-Feb-2019 21:34:39 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 0.262 Line_Spacing 0.192 Coordinate_Frame POS-TARG Pattern_Orient 18.39 Angle_Between_Sides 68.14 Center_Pattern NO ------------------------------------------------------------------------------------------------------------------------------------ 15606( 8) - 18-Feb-2019 21:34:39 - [ 5] Visit: 01 (GW170817_F606_1) Visit Requirements: ORIENT 320D TO 14 D; ORIENT 30D TO 52 D; ORIENT 70D TO 300 D; BETWEEN 26-FEB-2019:00:00:00 AND 07-APR-2019:00:00:00 On Hold Comments: Additional Comments: First 3-orbit visit of GW170817 to occur between Jan 1, 2019 and Aug 30, 2019, to be roughly coordinated with our first Chandra observation. ORIENT ranges are set to avoid a bright star falling near the edge of the chip, which can cause artifacts across the image. 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 GW170817 ACS/WFC ACCUM WFC1 F606W 3 500 S PATTERN 1 1 see below (6728 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 | ------------------------------------------------------------------------------------------------------------------------------------ GW170817 1 ACS/WFC ACCUM WFC1 F606W 1 none 1 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 1 none 2 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 1 none 3 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 2 none 1 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 2 none 2 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 2 none 3 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 3 none 1 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 3 none 2 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 3 none 3 none 3 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 4 none 1 none 3 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 4 none 2 none 3 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 4 none 3 none 3 570.0 S 15606( 8) - 18-Feb-2019 21:34:39 - [ 6] Visit: 02 (GW170817_F606_2) Visit Requirements: ORIENT 320D TO 14 D; ORIENT 30D TO 52 D; ORIENT 70D TO 300 D; AFTER 01 BY 0 D TO 20 D; BETWEEN 26-FEB-2019:00:00:00 AND 07-APR-2019:00:00:00 On Hold Comments: Additional Comments: Second 3-orbit visit of GW170817, to occur within a couple of weeks after the first visit, between Jan 1, 2019 and Aug 30, 2019. ORIENT ranges are set to avoid a bright star falling near the edge of the chip, which can cause artifacts across the image. 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 GW170817 ACS/WFC ACCUM WFC1 F606W 3 500 S PATTERN 1 1 see below (6728 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 | ------------------------------------------------------------------------------------------------------------------------------------ GW170817 1 ACS/WFC ACCUM WFC1 F606W 1 none 1 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 1 none 2 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 1 none 3 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 2 none 1 none 1 542.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 2 none 2 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 2 none 3 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 3 none 1 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 3 none 2 none 2 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 3 none 3 none 3 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 4 none 1 none 3 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 4 none 2 none 3 570.0 S GW170817 1 ACS/WFC ACCUM WFC1 F606W 4 none 3 none 3 570.0 S 15606( 8) - 18-Feb-2019 21:34:39 - [ 7] Summary Form for Proposal 15606 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC1 ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements AFTER 01 BY 0 D TO 20 D, BETWEEN 26-FEB-2019:00:00:00 AND 07-APR-2019:00:00:00, ORIENT 30D TO 52 D, ORIENT 320D TO 14 D, ORIENT 70D TO 300 D, PATTERN 1 1 ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F606W ------------------------------------------------------------------------------------------------------------------------------------ Target Names GW170817 ------------------------------------------------------------------------------------------------------------------------------------