0 Assigned ID: 1213 ----- Attempting Submission 1 (Fri Oct 02 02:06:57 GMT 2015) ----- HST Phase I Proposal 1213 (RT.apt) successfully submitted. Receipt: # 1213-1 ----- Attempting Submission 2 (Fri Oct 02 02:37:42 GMT 2015) ----- HST Phase I Proposal 1213 (RT.apt) successfully submitted. Receipt: # 1213-2 ----- Attempting Submission 3 (Fri Oct 02 03:51:42 GMT 2015) ----- HST Phase I Proposal 1213 (RT.apt) successfully submitted. Receipt: # 1213-3 0 ----- Attempting Submission 1 (Fri Dec 11 06:22:00 GMT 2015) ----- HST Phase II Proposal 14463 (RT-1.apt) successfully submitted. Receipt: # 14463-1 ----- Attempting Submission 2 (Fri Dec 11 19:27:57 GMT 2015) ----- Identifying the Progenitor of a New Red Transient Red transients are a recently-recognized, fundamentally new type of stellar outburst. At least one, V1309 Sco, was the first observed case of a merger between two nondegenerate stars. The outburst mechanism remains a matter of some disagreement. It is widely suspected that there is more than one different type of outburst occurring among the red transients. A major problem in trying to model the outburst mechanisms is that the spectral class of the progenitor object is fairly well known in only one or two cases. We have found a set of WFC3 images covering the field including one red transient in fifteen different photometric bandpasses. This will provide the most complete SED of any red transient progenitor, and hence the most precise spectroscopic classification. Also, the distance in this case is known to high precision. However, the uncertainty in the coordinates of this transient is such that several objects in the pre-outburst images might be the progenitor. We request a small amount of new WFC3 imaging to determine which object is the progenitor by comparing the location of the transient relative to other stars nearby in the new images. Once it is identified, we will perform photometry on the archival images to construct the SED of the progenitor and derive its spectral type. The combination of precise spectral type and precise distance will make this object fundamentally valuable for modeling red transients. Exposures of same field. Target is a transient detected by Spitzer in July, 2015. This field was imaged in these bandpasses by another program before the transient was discovered. The goal of our program is primarily to locate to within one pixel the precursor star in that crowded field so that archival data can be used to get an SED of it. The secondary goal is to obtain an SED of the transient. No data on this transient have been published except for the Spitzer data, and the transient's SED is not well known based on the nature of the source, so we use multple bandpasses based on a crude extrapolation of the slope from the Spitzer channels. COOL STARS 12 false false false false SUPPORTED EXT-STAR M III-I J2000 J2000 WFC3/UVIS Imaging No No F814W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.145 WFC3-IR-DITHER-BOX-MIN false false 2 46.84 WFC3-UVIS-DITHER-LINE 1 false POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false C:\Users\Zeke\Desktop\HST mid-cycle\OP-cache\RT-1-v07.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14463 :visit-id "07" :proposal-version -1 :trans-version "20150609" :date "11-Dec-2015 11:17:01.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 422320 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14463 :visit-id "07" :obset-id "07" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14463 :visit-id "07" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2896 :al-overhead-at-end 165 :internal-dur-at-end 498 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) true 1 0 C:\Users\Zeke\Desktop\HST mid-cycle\OP-cache\RT-1-v08.xml The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14463 :visit-id "08" :proposal-version -1 :trans-version "20150609" :date "11-Dec-2015 11:11:47.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "30" :si-bright-earth-limb-angle 20.0 :data-volume 1880224 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14463 :visit-id "08" :obset-id "08" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14463 :visit-id "08" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2868 :al-overhead-at-end 0 :internal-dur-at-end 595 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3229 :pcs-gap 0 ) true 1 0