Please find attached our first submission of a DDT for a recent GRB 191019A 1831630921 Assigned ID: 1173 ----- Attempting Submission 1 (Mon Oct 28 13:49:18 GMT 2019) ----- This is an updated submission which moves the target by a couple of different pos-targs in the hope that this will enable the observation to run with the requested orient. 493514722 ----- Attempting Submission 1 (Wed Nov 06 21:02:29 GMT 2019) ----- ----- Attempting Submission 2 (Fri Nov 08 20:58:01 GMT 2019) ----- ----- Attempting Submission 3 (Sun Mar 15 19:44:21 GMT 2020) ----- ----- Attempting Submission 4 (Fri Mar 20 15:55:46 GMT 2020) ----- This is to do with the number of orbits, but only one of visit 2, 3 or 4 will be executed. A long gamma-ray burst in an ancient galaxy Long-duration gamma-ray bursts are securely associated with the collapse of massive stars, and like core-collapse supernovae are always found in star-forming environments. The recent identification of GRB 191019A in a passive galaxy is, therefore, a major surprise. The source is close to the host nucleus (chance probability ~10^-6) and so is securely associated with the host. It is, therefore, imperative to determine the origin of the burst - does it arise from a core-collapse supernova in an environment never before seen for a long GRB? Was the event created via rare different channels (unusual binary evolution, dynamical interactions etc.) and so is it associated with a different kind of supernova? Does the proximity of the burst to its host nucleus imply a direct connection to the supermassive black hole, due either to unusual AGN activity or a tidal disruption event (TDE)? We propose a modest set of HST observations that will conclusively answer these questions. We will: (i) perform the most sensitive possible search for any associated supernova; (ii) pinpoint the source within its host galaxy with exceptional accuracy to determine if it may be associated with a TDE around a supermassive black hole; and (iii) track the decay to ascertain if the source vanishes or fades into an underlying active galaxy. These observations can conclusively determine the origin of GRB 191019A, and so provide direct constraints on the diversity of processes that can create gamma-ray burst-like explosions. We request to obtain two orbits of ACS grism observations of GRB 191019A in an apparently passive galaxy at z=0.23. Our experimental design is simple.We will obtain epochs 180 degrees (and approximately 180 days) apart to get a good subtraction of the host galaxy light. At each epoch we will obtain 1 F606W image (180s) duration and 4x400s exposures in G800L with a standard 4-point dither pattern. The team submitting this proposal has a great deal of expertise in studies of the transient Universe. The PI has led a total of 32 successful HST proposals that address the nature of gamma-ray bursts, supernovae, tidal disruption events and gravitational wave sources. These proposals have led to a large number of refereed papers reporting the observations. The CoIs also include experts on studies of supernovae and gamma-ray bursts, many of whom have significant HST experience. We also maintain a large scale follow-up operations with ground based facilities (in particular the VLT), and will supplement the data obtained here with ground based observations when the source is sufficiently bright. However, the observations that we propose are impractical from the ground. In addition to the previous expertise, we also have the currently available resources (individual time, postdoctoral support etc) to enable the timely analysis and publication of the observations obtained here. Stellar Physics Massive Black Holes And Their Host Galaxies 0 false SUPPORTED GALAXY ELLIPTICAL STAR FORMING REGION J2000 J2000 ACS/WFC Imaging No No F606W ACS/WFC Spectroscopic No No G800L ACS/WFC Imaging No No F606W ACS/WFC Spectroscopic No No G800L WFC3/UVIS Imaging No No F390W WFC3/UVIS Imaging No No F775W WFC3/UVIS Imaging No No F390W WFC3/UVIS Imaging No No F775W POS-TARG DITHER 0.262 LINE 0.192 false false 68.14 4 18.39 ACS-WFC-DITHER-BOX 1 false POS-TARG DITHER 3.034 LINE false false 2 85.29 ACS-WFC-DITHER-LINE 2 false POS-TARG DITHER 0.604 LINE false false 3 41.788 LINE 3 false The scheduling data was generated by CASM 28.0. CASM was run in Phase II mode. 1574047693000 63.55929251637829 (Tic-Visit :proposal-id 16051 :visit-id "01" :proposal-version -1 :trans-version "20191203" :date "20-Mar-2020 12:06:30.0" :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 1421120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16051 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16051 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2638 :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 3156 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 28.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16051 :visit-id "02" :proposal-version -1 :trans-version "20191203" :date "20-Mar-2020 12:06:31.0" :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 1421120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16051 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16051 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2642 :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 3156 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 28.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16051 :visit-id "03" :proposal-version -1 :trans-version "20191203" :date "20-Mar-2020 12:06:32.0" :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 1421120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16051 :visit-id "03" :obset-id "03" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16051 :visit-id "03" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2642 :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 3156 :pcs-gap 0 ) false 1 0 The scheduling data was generated by CASM 28.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 16051 :visit-id "04" :proposal-version -1 :trans-version "20191203" :date "20-Mar-2020 12:06:34.0" :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 1421120 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 16051 :visit-id "04" :obset-id "04" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 16051 :visit-id "04" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2642 :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 3156 :pcs-gap 0 ) false 1 0