0 Assigned ID: 525 ----- Attempting Submission 1 (Fri Apr 11 15:22:15 GMT 2014) ----- The number of orbits used exceeds the number allocated David Golimowski added 2 internal visits to obtain subarray bias frames for calibration of the science exposures. A GROUP-WITHIN constraint was added to Visit 01 to ensure that the bias frames are recorded within 14 days of the science exposures. The 2 internal orbits are charged to the Cycle 22 ACS Calibration Program. -728520573 ----- Attempting Submission 1 (Fri Jul 04 13:13:08 GMT 2014) ----- ----- Attempting Submission 2 (Fri Oct 03 18:17:44 GMT 2014) ----- New warnings are associated with the internal visits added to provide calibration reference bias frames for subarray science exposures. These warnings are benign and should be ignored. Stellar Forensics VI: A post-explosion view of the progenitor of SN 2012aw Recent studies have used high spatial resolution HST observations of supernova (SN) sites to directly identify the progenitors of core-collapse SNe in pre-explosion images. These studies have set constraints about the nature of massive stars and their evolution just prior to explosion. Now, at late-times when the SNe have faded sufficiently, it is possible to return to the sites of these core-collapse SNe to search for clues about the nature of their progenitors. We request time to conduct deep, late-time, high-resolution imaging with ACS/WFC of the site of the core-collapse SN 2012aw. We aim to: 1) Confirm our original identification, made in pre-explosion images, by confirming that the progenitor is now missing; 2) Apply image subtraction techniques for this late-time imaging with our pre-explosion images to determine accurate photometry of the progenitor to constrain the temperature and luminosity. HST provides the unique combination of high-resolution optical imaging at very faint magnitudes that will facilitate this study. We aim to acquire deep ACS/WFC F555W and F814W imaging observations of the site of SN 2012aw. The observations adopt a box dither pattern to improve PSF sampling, as well as enable the rejection of CRs and hot pixels. We place a loose constraint that the observations be acquired after March 2015 - to ensure that the SN has faded sufficiently for our science goals. CALIBRATION ORBITS: As per STScI policy, 2 internal orbits have been added to this proposal for the purpose of obtaining subarray bias frames that are contemporaneous with the science observations. These internal orbits will be charged to STScI's Cycle 22 ACS Calibration Program. The ACS Instrument Team at STScI is responsible for producing superbias reference files from the bias frames obtained in this GO proposal. HOT STARS 12 false false false false false SUPPORTED EXT-STAR SUPERNOVA TYPE II 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 F814W POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false /private/var/folders/2w/3zgcdz2n75d5pwpctrwqmvl000048_/T/OPVisit2091977701957326790.xml Timing link suitability includes constraints ([Group (01 A1 A2) Within 14.0 days]) The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. 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CASM was run in Phase II mode. This orbit is charged to the Cycle 22 ACS Subarray Bias Calibration Program. Avoid SAA passages; SAA-impacted orbits are usable. 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