Assigned ID: 3053 ----- Attempting Submission 1 (Wed Aug 29 13:55:29 GMT 2012) ----- chandra ----- Attempting Submission 1 (Mon Oct 15 17:17:26 GMT 2012) ----- Joint Chandra and HST Monitoring and Studies of the Crab Nebula In 2010 Sep the Crab surprised the astrophysical community with a powerful gamma-ray flare, detected by the Agile and Fermi satellites. In 2011 it also became apparant that the nebula has been exhibiting up to 7% variability in hard X-rays for over a decade. The scientific purpose of this proposal is to: 1) To (continue to) identify, quantify, and correlate the spatial and spectral variations in X-rays and the optical over time 2) Establish both an X-ray and optical baseline of the system prior to any future gamma-ray flare as an aid for establishing the location of the flare. 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 5 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 January, February, April, August, October 2013. 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) 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. HOT STARS 12 false 0.0 0.0 false false false false SUPPORTED STAR NEUTRON STAR PULSAR This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F555W ACS/WFC Imaging No No F555W POS-TARG DITHER 3.5 Dithering is aimed at filling the inter-chip gap as well as at rejecting CR hits LINE 0.5 false false 85.28 4 85.28 ACS-WFC-DITHER-BOX 1 false /castor/deluca/OP-cache/crab-monitoring-cycle20-phaseII-v01.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13109 :visit-id "01" :proposal-version -1 :trans-version "20120615" :date "15-Oct-2012 18:09:54.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13109 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13109 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2704 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3092 :pcs-gap 0 ) true 1 0 /castor/deluca/OP-cache/crab-monitoring-cycle20-phaseII-v02.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13109 :visit-id "02" :proposal-version -1 :trans-version "20120615" :date "15-Oct-2012 18:11:57.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13109 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13109 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2704 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3092 :pcs-gap 0 ) true 1 0 /castor/deluca/OP-cache/crab-monitoring-cycle20-phaseII-v03.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13109 :visit-id "03" :proposal-version -1 :trans-version "20120615" :date "15-Oct-2012 18:13:15.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13109 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13109 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2704 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3092 :pcs-gap 0 ) true 1 0 /castor/deluca/OP-cache/crab-monitoring-cycle20-phaseII-v04.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13109 :visit-id "04" :proposal-version -1 :trans-version "20120615" :date "15-Oct-2012 18:14:35.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13109 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13109 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2704 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3092 :pcs-gap 0 ) true 1 0 /castor/deluca/OP-cache/crab-monitoring-cycle20-phaseII-v05.xml The scheduling data was generated by CASM 20.2. CASM was run in Phase II mode. 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