Scientific Category is a required field. Science Keywords: Select from 2 to 5 items. Please specify your scheduling constraints or 'No Constraints' on all Observation forms. 0 Assigned ID: 1127 ----- Attempting Submission 1 (Wed Aug 19 13:44:05 GMT 2020) ----- Joint Chandra/HST Dear Alison and Ray -- Applied small pos-targ shift to Exp 3 as I did not see how apply a linear dither to 2 & 3. If you know how to do that, please feel free to discard this subission and modify the previous version. Thanks -- Roger -427664922 ----- Attempting Submission 1 (Tue Sep 01 00:35:38 GMT 2020) ----- HST Phase II Proposal 16426 successfully submitted. Receipt: # 16426-1 ----- Attempting Submission 2 (Thu Sep 03 15:28:33 GMT 2020) ----- HST Phase II Proposal 16426 successfully submitted. Receipt: # 16426-2 ----- Attempting Submission 3 (Thu Sep 03 17:55:30 GMT 2020) ----- ----- Attempting Submission 4 (Fri Sep 04 00:21:12 GMT 2020) ----- We propose a new observation of the remarkable X-ray `filament' of the Guitar nebula. Synchrotron emission from this structure shows that pulsar-generated multi-TeV e+/- are escaping to the ISM and propagating at large angle to the pulsar motion. Our observation provides the first sensitive spectral study of the cooling in this structure, which probes the e+/- evolution. This pulsar's very high proper motion shifts the e+/- injection position noticably between CXO imaging epochs; the 2021 image can be compared with past (2012, 2006 and 2000) snapshots to directly measure the synchrotron fading with age. Paired with a contemporaneous HST Halpha image, we also relate the standoff of the pulsar bowshock to the filament emission, a key test of particle escape models. ACS/WFC F658+F625 n/a Stellar Physics and Stellar Types 6 false false false false false false false SUPPORTED STAR PULSAR Donot pplyt PM to target position. J2000 J2000 ACS/WFC Imaging No No F658N ACS/WFC Imaging No No F625W POS-TARG DITHER 0.325 LINE false true 5 0 SPIRAL 1 false 1599178151165 The scheduling data was generated by CASM 28.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16426 :visit-id "01" :proposal-version -1 :trans-version "20200620" :date "03-Sep-2020 17:09:11.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 3 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1989568 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16426 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :cvz T :proposal-id 16426 :visit-id "01" :orbit-number 1 :pcs-time 383 :si-vis-utilization 16413 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 0 :low-sky "N" :pcs-visibility 0 :pcs-gap 0 ) false 3 0