Changed cycle to 23 -508237120 ----- Attempting Submission 2 (Wed Jun 29 20:52:53 GMT 2016) ----- in-house 2E 1613.5-5053, a likely neutron star, is a X-ray bright source at the center of a young 2-kyr supernova remnant RCW 103. Despite 30 years of study, its true nature is a mystery. It shows behavior reminiscent of magnetars yet has a periodicity of 6.67 hrs -- too slow to be a rotational period, but also very unlikely to be a binary orbital period. On 2016 June 22, it emitted a bright 8-ms, magnetar-like burst detected by Swift-BAT and is now 15 times brighter in 0.5-10 keV X-ray luminosity compared to quiesence. We request rapid deep F110W and F160W imaging of this target to find a fading counterpart, or put strong limits on its presence. We request the first observation to be conducted within a week, with the next scheduled after about a month. Either result will be distinctive for the proposed theoretical models -- a magnetar in a very low mass X-ray binary (LMXB), a magnetar with a fall-back disk or a `pre'-LMXB. We'll observe 2E 1613.5-5053 with WFC3 in F110W and F160W, once within a week (Visit 1) and once after a month or two (Visit 2). In each visit, each filter, we'll use the standard 4 position dither pattern. The aim is to observe a possibly brightened and fading IR counterpart of a weird neutron star that had a magnetar-like outburst last week. There are 7 stars in the 0.7" radius Chandra error circle. Stellar Physics 3 SUPPORTED UNIDENTIFIED X-RAY EMITTER NO This object was generated by the target selector and retrieved from the SIMBAD database. J2000 J2000 Target does not yet have a confirmed optical/IR counterpart. WFC3/IR Imaging No No F160W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F110W WFC3/IR Imaging No No F160W POS-TARG DITHER 0.572 LINE 0.365 false false 74.653 4 18.528 WFC3-IR-DITHER-BOX-MIN 1 false 1467212285521 The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14814 :visit-id "01" :proposal-version -1 :trans-version "20160322" :date "29-Jun-2016 10:58:05.0" :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 627104 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14814 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14814 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3046 :al-overhead-at-end 0 :internal-dur-at-end 479 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3403 :pcs-gap 0 ) false 1 0 1467212289140 The scheduling data was generated by CASM 24.0. CASM was run in Phase II mode. (Tic-Visit :proposal-id 14814 :visit-id "02" :proposal-version -1 :trans-version "20160322" :date "29-Jun-2016 10:58:08.0" :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 627104 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 14814 :visit-id "02" :obset-id "02" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 14814 :visit-id "02" :orbit-number 1 :pcs-time 333 :si-vis-utilization 3046 :al-overhead-at-end 0 :internal-dur-at-end 479 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3403 :pcs-gap 0 ) false 1 0