14329( 2) - 24-Jul-2015 14:41:27 - [ 1] HUBBLE SPACE TELESCOPE OBSERVING PROGRAM 14329 Version: 2 Check-in Time: 24-Jul-2015 14:41:27 STScI Edit Number: 1 Title Joint Chandra and HST Monitoring and Studies of the Crab Nebula ------------------------------------------------------------------------------------ Type Cycle GO 23 ------------------------------------------------------------------------------------ Investigators Contact? PI: Dr. Martin C. Weisskopf NASA Marshall Space Flight Center Y CoI: Dr. Allyn Tennant NASA Marshall Space Flight Center N CoI: Prof. Jonathan Arons University of California - Berkeley N CoI: Prof. Roger D. Blandford Stanford University N CoI: Dr. Rolf Buehler Deutsches Elektronen Synchrotron N CoI: Dr. Patrizia A. Caraveo INAF, Istituto di Astrofisica Spaziale e N Fisica CoI: Dr. E. Costa CNR, Istituto di Astrofisica Spaziale N CoI: Dr. Andrea De Luca INAF, Istituto di Astrofisica Spaziale e N Fisica CoI: Dr. Stefan Funk Stanford University N CoI: Prof. Dieter Horns Universitat Hamburg Institute of N Experimental Physics CoI: Dr. Andrei Lobanov Max-Planck-Institut fur Radioastronomie N CoI: Dr. Claire Ellen Max Lawrence Livermore National Laboratory N CoI: Dr. Roberto Mignani INAF, Istituto di Astrofisica Spaziale e N Fisica CoI: Dr. Stephen O'Dell NASA Ames Research Center N CoI: Dr. Marco Tavani INAF, Istituto di Astrofisica Spaziale e N Fisica CoI: Colleen Wilson-Hodge NASA Marshall Space Flight Center N CoI: Yajie Yuan Stanford Research Systems N ------------------------------------------------------------------------------------ Abstract The scientific purpose of this proposal is three-fold: (1) Continue to quantify and correlate the Crab s X-ray and optical, temporal and spatial variations, developing a legacy database for high-spatial-resolution studies of this astrophysical archetype; (2) identify and explore phenomena responsible for the recently discovered fact that the Crab is not a standard candle in hard X-rays; and (3) establish X-ray and optical baselines, to aid in determining the location and physics of the Crab s gamma-ray flares. ------------------------------------------------------------------------------------ Observations Description ------------------------ The program is part of a multiwavelength (X-ray and optical) monitoring campaign of the Crab pulsar and inner Nebula. It consists in a series of 4 ACS imaging observations in the F550M filter, to be performed quasi-simultaneously (within 10 days maximum) with Chandra/ACIS imaging observations. We ask to observe the target in November 2015, as well as in January, April and August 2016. For each epoch, we have selected a time window (spanning 10 days) in which the target is visible. The HST visits (as well as the Chandra ones) 14329( 2) - 24-Jul-2015 14:41:27 - [ 2] should be scheduled within such windows. The same instrumental setup will be adopted for each visit. To fully cover the FOV of our Chandra observations (150"x150"), we will use the ACS/WFC with the WFC aperture. A box dithering pattern will be implemented to fill the inter-chip gap as well as to reject cosmic ray hits. Setting an exposure of 500 s for each position of the dithering pattern results in 2000 s exposure time per visit, which is well suited to achieve our goals and allows for an optimal use of the orbital visibility window. ------------------------------------------------------------------------------------ 14329( 2) - 24-Jul-2015 14:41:27 - [ 3] TARGET LIST Fixed Targets ------------------------------------------------------------------------------------------------------------------------------------ Tar| Target | Target | Target |Coord | Radial | Flux data No | Name | Description | Position |Eqnx | Vel. | ------------------------------------------------------------------------------------------------------------------------------------ 1 CRAB-NEBULA STAR, NEUTRON STAR, RA=05H34M31.9400S, J2000 V = 16.5 PULSAR DEC=+22D00'52.18" Reference Frame: ICRS ------------------------------------------------------------------------------------------------------------------------------------ 14329( 2) - 24-Jul-2015 14:41:27 - [ 4] Patterns ------------------------------------------------------------------------------------------------------------------------------------ Pattern_Number: 1 Primary_Pattern Secondary_Pattern Pattern_Type ACS-WFC-DITHER-BOX Pattern_Purpose DITHER Number_Of_Points 4 Point_Spacing 3.5 Line_Spacing 0.5 Coordinate_Frame POS-TARG Pattern_Orient 85.28 Angle_Between_Sides 85.28 Center_Pattern NO Pattern_Comments: Dithering is aimed at filling the inter-chip gap as well as at rejecting CR hits ------------------------------------------------------------------------------------------------------------------------------------ 14329( 2) - 24-Jul-2015 14:41:27 - [ 5] Visit: 01 Visit Requirements: SCHED 80%; BETWEEN 01-NOV-2015:00:00:00 AND 10-NOV-2015:00:00:00 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 CRAB-NEBULA ACS/WFC ACCUM WFC F550M 1 500 S PATTERN 1 1 (2000 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 | ------------------------------------------------------------------------------------------------------------------------------------ CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 1 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 2 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 3 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 4 none none none 1 N/A 14329( 2) - 24-Jul-2015 14:41:27 - [ 6] Visit: 02 Visit Requirements: SCHED 80%; BETWEEN 20-JAN-2016:00:00:00 AND 01-FEB-2016:00:00:00 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 CRAB-NEBULA ACS/WFC ACCUM WFC F550M 1 500 S PATTERN 1 1 (2000 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 | ------------------------------------------------------------------------------------------------------------------------------------ CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 1 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 2 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 3 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 4 none none none 1 N/A 14329( 2) - 24-Jul-2015 14:41:27 - [ 7] Visit: 03 Visit Requirements: SCHED 80%; BETWEEN 12-APR-2016:00:00:00 AND 23-APR-2016:00:00:00 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 CRAB-NEBULA ACS/WFC ACCUM WFC F550M 1 500 S PATTERN 1 1 (2000 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 | ------------------------------------------------------------------------------------------------------------------------------------ CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 1 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 2 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 3 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 4 none none none 1 N/A 14329( 2) - 24-Jul-2015 14:41:27 - [ 8] Visit: 04 Visit Requirements: SCHED 80%; BETWEEN 07-AUG-2016:00:00:00 AND 18-AUG-2016:00:00:00 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 CRAB-NEBULA ACS/WFC ACCUM WFC F550M 1 500 S PATTERN 1 1 (2000 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 | ------------------------------------------------------------------------------------------------------------------------------------ CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 1 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 2 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 3 none none none 1 N/A CRAB-NEBULA 1 ACS/WFC ACCUM WFC F550M 4 none none none 1 N/A 14329( 2) - 24-Jul-2015 14:41:27 - [ 9] Summary Form for Proposal 14329 Item Used in this proposal ------------------------------------------------------------------------------------------------------------------------------------ Apertures WFC ------------------------------------------------------------------------------------------------------------------------------------ Configurations ACS/WFC ------------------------------------------------------------------------------------------------------------------------------------ Opmodes ACCUM ------------------------------------------------------------------------------------------------------------------------------------ Optional Parameters ------------------------------------------------------------------------------------------------------------------------------------ Special Requirements BETWEEN 01-NOV-2015:00:00:00 AND 10-NOV-2015:00:00:00, BETWEEN 07-AUG-2016:00:00:00 AND 18-AUG-2016:00:00:00, BETWEEN 12-APR-2016:00:00:00 AND 23-APR-2016:00:00:00, BETWEEN 20-JAN-2016:00:00:00 AND 01-FEB-2016:00:00:00, PATTERN 1 1, SCHED 80% ------------------------------------------------------------------------------------------------------------------------------------ Spectral Elements F550M ------------------------------------------------------------------------------------------------------------------------------------ Target Names CRAB-NEBULA ------------------------------------------------------------------------------------------------------------------------------------