0 Assigned ID: 833 ----- Attempting Submission 1 (Fri Apr 10 21:06:42 GMT 2015) ----- 0 ----- Attempting Submission 2 (Mon Oct 26 21:50:09 GMT 2015) ----- ----- Attempting Submission 3 (Fri Jun 24 20:03:52 GMT 2016) ----- Identify the signature of neutron star mergers through rapid Chandra/Hubble observations of a short GRB The afterglow of some short GRBs displays a late-time rebrightening, visible a few days after the gamma-ray burst. Recent HST observations provided tantalizing evidence that such late-time bump could be explained as the emergence of the underlying kilonova emission. This would represent the incontrovertible signature of a neutron star merger, and the first direct link between short GRBs and their progenitors. Here we ask for a rapid and deep Chandra/HST follow-up observation of a short duration GRB in order to detect the expected kilonova bump, and to constrain the origin of the observed emission. Multi-band observations, and in particular X-rays, are critical to pin down the nature of the observed rebrightening, and to distinguish it from the standard afterglow emission. We request two initial epochs to check for the kilonova onset. The third epoch will be planned at a later time if necessary. Each epoch will consist of three orbits. The first visit should happen in 3 days since the ToO activation. The second visit in 7 days since the ToO activation. The total request is 6 orbits. COSMOLOGY 3 false false false false false false SUPPORTED EXT-STAR GAMMA RAY BURSTER NO J2000 WFC3/UVIS Imaging No No F606W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.265 LINE 0.187 false false 69.05 4 20.67 ACS-WFC-DITHER-BOX 1 false POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 2 false Timing link suitability includes constraints ([04 After 01 by 4.0 to 6.0 days]) The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit4409403120217673884.xml (Tic-Visit :proposal-id 14357 :visit-id "01" :proposal-version -1 :trans-version "20160322" :date "24-Jun-2016 16:44:42.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14357 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14357 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2654 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 GRB trigger Timing link suitability includes constraints ([05 After 02 by 4.0 to 6.0 days]) The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit7244285137862702780.xml (Tic-Visit :proposal-id 14357 :visit-id "02" :proposal-version -1 :trans-version "20160322" :date "24-Jun-2016 16:47:55.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14357 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14357 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 GRB trigger Timing link suitability includes constraints ([06 After 03 by 4.0 to 6.0 days]) The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit36813745287733449.xml (Tic-Visit :proposal-id 14357 :visit-id "03" :proposal-version -1 :trans-version "20160322" :date "24-Jun-2016 16:48:53.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14357 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14357 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 GRB trigger Timing link suitability includes constraints ([04 After 01 by 4.0 to 6.0 days]) The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit2497439043287103024.xml (Tic-Visit :proposal-id 14357 :visit-id "04" :proposal-version -1 :trans-version "20160322" :date "24-Jun-2016 16:46:22.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14357 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14357 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2654 :al-overhead-at-end 0 :internal-dur-at-end 347 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 GRB trigger Timing link suitability includes constraints ([05 After 02 by 4.0 to 6.0 days]) The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit4251251599169046788.xml (Tic-Visit :proposal-id 14357 :visit-id "05" :proposal-version -1 :trans-version "20160322" :date "24-Jun-2016 16:49:16.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14357 :visit-id "05" :obset-id "05" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14357 :visit-id "05" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 GRB trigger Timing link suitability includes constraints ([06 After 03 by 4.0 to 6.0 days]) The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. /private/var/folders/56/c_jk44c970v8fj73rtx427cm0006v6/T/OPVisit7558779674787858533.xml (Tic-Visit :proposal-id 14357 :visit-id "06" :proposal-version -1 :trans-version "20160322" :date "24-Jun-2016 16:52:10.0" :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 974896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14357 :visit-id "06" :obset-id "06" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14357 :visit-id "06" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2640 :al-overhead-at-end 0 :internal-dur-at-end 481 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 2993 :pcs-gap 0 ) true 1 0 GRB trigger