0 Assigned ID: 2537 ----- Attempting Submission 1 (Sun Sep 14 00:47:38 GMT 2014) ----- ORBITAL VISIBILITY OVERRUN Please find attached an updated submission for 13949. This includes visits 02 and 03 for observations of GRB 140331A and 150616A. This should complete this program. Thanks. -1789616686 ----- Attempting Submission 1 (Tue Oct 28 21:55:58 GMT 2014) ----- ----- Attempting Submission 2 (Mon Nov 10 13:23:55 GMT 2014) ----- ----- Attempting Submission 3 (Thu Mar 26 14:30:34 GMT 2015) ----- ----- Attempting Submission 4 (Mon Sep 28 13:57:53 GMT 2015) ----- The orbital visibility overrun refers to an already executed visit (presumably issues with the new version of APT) and should not affect the submitted visits. A Chandra/HST survey of dark gamma-ray bursts Dark gamma-ray bursts (GRBs) -- where the optical emission is apparently suppressed -- can only be reliably localized by their X-ray afterglows. Here we propose to continue a survey using the sensitivity and point spread function of Chandra to precisely pinpoint the GRB locations, and HST to locate and study the host galaxies. Our results to date are suggestive of most dark GRBs originating in more luminous galaxies than "bright" GRBs. Our new observations will increase the statistical certainty of this result, while simultaneously allowing us to more precisely identify the minority of dark GRBs which most likely originate from the highest redshifts. We propose to observe HST observations to identify and study the host galaxies of dark GRBs. These bursts will have sub-arcsecond positions from our Chandra observations, and we will use HST to identify the hosts and study their luminosities and morphologies. In some cases nothing will be known about the host galaxies prior to the observations, in others they may have been identified in ground based imaging. For each host galaxy we will obtain F606W and F160W observations, but may vary the exposure time depending on the information available at the time. For this reason we have included two strategies, the first utilizes F606W and F160W observations within a single orbit with WFC3 (3-point line dithers in each case). The second splits the F606W and F160W observations between 2-orbits, using ACS/WFC3 for the first orbit and WFC3/IR for the second. In each case we will use a 4-point dither within the orbit. We have utlized the WFC-CTE aperture for the ACS observations to minimize the impact of CTE. On triggering we will also include a POS-TARG offset for the UVIS observations to place the targets close to the corner of the chip (the precise pos-targs, choice of chip may need to be determined by availablility of guide stars etc). HOT STARS 12 false false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY STAR FORMING REGION STARBURST J2000 GALAXY SPIRAL J2000 GALAXY STAR FORMING REGION STARBURST J2000 GALAXY STAR FORMING REGION STARBURST J2000 GALAXY STAR FORMING REGION STARBURST Awaiting GRB trigger ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F160W ACS/WFC Imaging No No F606W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 2 false POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 3 false POS-TARG DITHER 0.605 LINE false false 3 41.788 WFC3-IR-DITHER-LINE-3PT 4 false POS-TARG DITHER 0.135 LINE false false 3 46.84 WFC3-UVIS-DITHER-LINE-3PT 5 false POS-TARG DITHER 0.145 LINE false false 2 46.84 WFC3-UVIS-DITHER-LINE 6 false POS-TARG DITHER 0.636 LINE false false 2 41.788 WFC3-IR-DITHER-LINE 7 false The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. /private/var/folders/8d/jkscrd891rl041p94sl_wts40000gn/T/OPVisit8335159697721889539.xml 1417285531000 307.4042204866173 (Tic-Visit :proposal-id 13949 :visit-id "01" :proposal-version -1 :trans-version "20150609" :date "28-Sep-2015 14:56:20.0" :trans-errors '(:WARNINGS 1 :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 1388512 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13949 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13949 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3135 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3456 :pcs-gap 0 ) true 1 1 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. /private/var/folders/8d/jkscrd891rl041p94sl_wts40000gn/T/OPVisit7033964664679793155.xml (Tic-Visit :proposal-id 13949 :visit-id "02" :proposal-version -1 :trans-version "20150609" :date "28-Sep-2015 14:56:24.0" :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 1388512 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13949 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13949 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2877 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. /private/var/folders/8d/jkscrd891rl041p94sl_wts40000gn/T/OPVisit5544347662692033245.xml (Tic-Visit :proposal-id 13949 :visit-id "03" :proposal-version -1 :trans-version "20150609" :date "28-Sep-2015 14:56:29.0" :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 1388512 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13949 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13949 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3069 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3403 :pcs-gap 0 ) true 1 0 The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. /private/var/folders/8d/jkscrd891rl041p94sl_wts40000gn/T/OPVisit8866271784146847108.xml (Tic-Visit :proposal-id 13949 :visit-id "04" :proposal-version -1 :trans-version "20150609" :date "28-Sep-2015 14:56:33.0" :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 1061936 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13949 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13949 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2844 :al-overhead-at-end 0 :internal-dur-at-end 424 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3210 :pcs-gap 0 ) true 1 0 Awaiting GRB positio The scheduling data was generated by CASM 23.2. CASM was run in Phase II mode. /private/var/folders/8d/jkscrd891rl041p94sl_wts40000gn/T/OPVisit8709846520910214975.xml 1433368395000 127.0 (Tic-Visit :proposal-id 13949 :visit-id "05" :proposal-version -1 :trans-version "20150609" :date "28-Sep-2015 14:56:37.0" :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 1617840 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13949 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13949 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2851 :al-overhead-at-end 0 :internal-dur-at-end 587 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3221 :pcs-gap 0 ) true 1 0