Please find attached an updated version of our proposal for late time observations of Swift J2058+0516 479276605 Assigned ID: 1258 ----- Attempting Submission 1 (Thu Feb 28 19:01:36 GMT 2013) ----- HST Phase I Proposal 1258 (late_tde_c21.apt) successfully submitted. ----- Attempting Submission 2 (Fri Mar 01 17:08:53 GMT 2013) ----- Please find attached our submission for GO 13479 for observations of Swift J2058+0516. Please let us know if you have any questions regarding this programme. 207733420 ----- Attempting Submission 1 (Wed Jun 26 17:00:56 GMT 2013) ----- The host and location of the candidate relativistic tidal disruption event Swift 2058+0516 Recent panchromatic observations have revealed a new class of high energy transient. These systems persist as bright gamma-ray sources for days, with luminosities in excess of the Eddington limit for a 10^10 solar mass black hole. They are accompanied by bright, long-lived (months to years) X-ray emission, and rather fainter, but still clearly detectable optical and IR counterparts. They are suggested to arise from the tidal disruption of stars in the nuclei of their host galaxies, which create a powerful relativistic outflow. In the first case (Swift J1644+57) astrometry ties the transient to nucleus of its host galaxy, lending support to this picture. However, other models have been postulated, such as the collapse of a giant star, where the outer envelope forms a disc that powers the observed transients, akin to a scaled-up gamma-ray burst. A key distinguishing feature between the two progenitors is their expected locations. Tidal disruptions must be uniquely nuclear, while GRB-like events are consistent with the nuclei of their hosts only 1/6 of the time. Here we propose to obtain deep observations of the second of these events -- Swift J2058+0516. These deep observations will detect and resolve its host galaxy, providing (via our earlier DDT observations) a precise location on the host. An IR visit will also provide a color for the host, and an estimate of its stellar and (through the bulge mass -- black hole mass relation) black hole mass. These data will provide the key astrometric and photometric evidence to disentagle competing models for these events, and will greatly aid the development of a definitive understanding of this new class of transient. We propose deep observations of the location of the candidate tidal disruption event Swift J2058+0516. We will conduct two orbits of observations with ACS/WFC in F606W. These observations will utilize a 4-point dither, with indivdual ~1200s exposures. As we are interested in a compact point source we will place the source at the WFC1-CTE aperture. We will also obtain a single orbit of F160W observations with WFC3/IR channel. The source will be placed at the default aim point with a 4-point dither. In case there is any ongoing transient emission we ask for the observations to be placed relatively close to one another in time ~+/- 2 weeks. AGN/QUASARS 12 false false 0.0 0.0 false false false SUPPORTED GALAXY HIGH REDSHIFT GALAXY J2000 J2000 WFC3/UVIS Imaging No No F475W 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 /Users/levan/OP-cache/13479_swift2058-v01.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13479 :visit-id "01" :proposal-version -1 :trans-version "20130502" :date "25-Jun-2013 12:21:36.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 2 :saa-model "27" :si-bright-earth-limb-angle 20.0 :data-volume 1136896 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13479 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13479 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2900 :al-overhead-at-end 0 :internal-dur-at-end 0 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3233 :pcs-gap 0 ) (Tic-Orbit :proposal-id 13479 :visit-id "01" :orbit-number 2 :pcs-time 222 :si-vis-utilization 3010 :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 3233 :pcs-gap 0 ) true 2 0 /Users/levan/OP-cache/13479_swift2058-v02.xml The scheduling data was generated by CASM 21.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13479 :visit-id "02" :proposal-version -1 :trans-version "20130502" :date "25-Jun-2013 12:18:58.0" :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 1044528 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13479 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13479 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2840 :al-overhead-at-end 0 :internal-dur-at-end 519 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3233 :pcs-gap 0 ) true 1 0