0 Assigned ID: 1358 ----- Attempting Submission 1 (Fri Mar 01 02:09:01 GMT 2013) ----- 0 ----- Attempting Submission 1 (Mon Jun 17 14:35:33 GMT 2013) ----- HST Phase II Proposal 13392 (Phase2_c21.apt) successfully submitted. ----- Attempting Submission 2 (Tue Jun 25 02:21:59 GMT 2013) ----- Reconstructing the circumstellar (CS) environment around a supernova (SN) is critical to studying the evolution and mass-loss mechanisms of massive stars, and in establishing the extent to which SNe and their progenitors contribute to the dust found in the early universe. Over the last decade, we have been performing all of these studies through imaging analyses and radiative-transfer modeling of HST optical and Spitzer mid-IR observations of the three SNe 1980K, 2002hh, and 2004et (all within "The Fireworks Galaxy" NGC 6946). These SNe all show evidence of optical and thermal echoes (see below) off of CS material. For each object, a variety of actual CS geometries fit the data equally well, since we have no recent optical images to disentangle important ambiguities in our analyses. Using 5 orbits of HST WFC3/UVIS and 1.6 hours of Spitzer, we propose to image these 3 SNe, which will provide crucial late-time data needed to complete our light-echo modeling. We will also attempt to recover the historic SNe 1917A and 1969P, and will continue our studies of the SN-imposter 2008S, all of which are in the same fields of view. Light echoes are one of the most powerful and efficient means to directly probe of the structure and composition of dust in CS environments, since echoes provide exact three-dimensional positions of dust while constraining its density, grain-size and chemical make-up. However, echoes pass through a given point only once, and since potential data are permanently lost for each epoch that echoes are not observed, most of the science we propose cannot be achieved if these observations are not taken this cycle. This Phase 2 sequence is intended to image SNe 1980K and 2004et in one pointing, and SNe 1917A, 1969P, 2002hh, and 2008S in another pointing. The first pointing can image both targets using the UVIS1 chip and therefore has no restrictions on roll angle, however the second pointing requires that the full array be used, which eliminates roll angles 25-45 and 205-225 degrees. These restrictions have been coded into the visit roll-angle requirements. Also, please note that these HST observations must occur within 1 month of approved Spitzer observations of the same field. Given the restrictions on roll angle, and the fact that this field will be viewed by another Spitzer proposal in mid-to-late 2013, the best window for HST observations is 17 Feb 2014 to 7 Mar 2014. Each target needs to be imaged in a four-point sub-pixel dither pattern so that higher spatial resolution can be gained using drizzling. Each target requires exposure times of at least 1600 sec in F606W and F814W, and 2400 sec in F438W. We have allowed APT to resize the exposures to fill each of the 5 allotted orbits, giving slightly-higher observing times for each filter. Note that although these exposure times are much longer than strictly needed to reach S/N = 10 for a V = 25 point-source (roughly the level of our faintest targets), our previous programs have clearly demonstrated that these longer exposures dramatically reduce background noise, which is crucial when probing for very faint echoes or marginally-resolved sources. ISM AND CIRCUMSTELLAR MATTER 12 false false 0.0 0.0 0.0 1.6 false false false SUPPORTED EXT-MEDIUM EJECTA REFLECTION NEBULA SNR WIND This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 EXT-MEDIUM EJECTA REFLECTION NEBULA SNR WIND This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W WFC3/UVIS Imaging No No F438W WFC3/UVIS Imaging No No F606W WFC3/UVIS Imaging No No F814W POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false 1372126818862 /Users/besug001/research/obsprop/Hubble13/echoes/OP-cache/Phase2_c21-v01.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. This proposal included 1.6 hours of Spitzer time to image the same fields with IRAC bands 1-2 (PID 10002). The Spitzer observation needs to happen within 1 month of the HST observation, and preferably as close as possible. The Spitzer visibility window is 02 Aug 2013 to 04 Apr 2014. Given the restrictions on roll angle, and the fact that this field will be viewed by another Spitzer proposal in mid-to-late 2013, the best window for HST observations is 17 Feb 2014 to 7 Mar 2014. We have put this in as a timing constraint in this proposal and the coordinated Spitzer AORs. (Tic-Visit :proposal-id 13392 :visit-id "01" :proposal-version -1 :trans-version "20130502" :date "24-Jun-2013 22:20:16.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 5 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 6929984 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13392 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Obset :proposal-id 13392 :visit-id "01" :obset-id "A1" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13392 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3178 :al-overhead-at-end 122 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13392 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3287 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13392 :visit-id "01" :orbit-number 3 :pcs-time 222 :si-vis-utilization 3257 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13392 :visit-id "01" :orbit-number 4 :pcs-time 222 :si-vis-utilization 3203 :al-overhead-at-end 116 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13392 :visit-id "01" :orbit-number 5 :pcs-time 222 :si-vis-utilization 3286 :al-overhead-at-end 122 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3511 :pcs-gap 0 ) true 5 0