GCN Circular 17036
V. D'Elia (ASDC) & L. Izzo (URoma/ICRA) report on behalf of the Swift-XRT team Swift-XRT has observed the error box of the IPN GRB 141104A (Hurley et al. GCN 17026) in a series of observations tiled on the sky. The total exposure time is 14.0 ks spread over 3 fields. The observations started ~ 3 days after the IPN trigger. We detect four sources with S/N ~ 3 or higher, within or close to the IPN error box. Namely (ordered by ascending Dec): Source 1 RA: 279.53959 = 18h 38m 9.50s (J2000) Dec: -13.06216 = -13d 03' 43.8" J(2000) Err: 4.4 arcsec (radius, 90% confidence). Exposure time: 3.9 ks. Source 2 RA: 279.51690 = 18h 38m 4.06s (J2000) Dec: -12.78750 = -12d 47' 15.0" (J2000) Err: 4.9 arcsec (radius, 90% confidence) Exposure time: 4.4 ks Source 3 RA: 279.38702 = 18h 37m 32.88s (J2000) Dec: -12.34930 = -12d 20' 57.5" (J2000) Err: 3.8 arcsec (radius, 90% confidence). Exposure time: 3.4 ks. Source 4 RA: 279.49073 = 18h 37m 57.78s (J2000) Dec: -12.30119 = -12d 18' 04.3" (J2000) Err: 4.6 arcsec (radius, 90% confidence). Exposure time: 3.1 ks. The northernmost Sources #3 and #4 are close to (#3) or just outside (#4) the IPN error box and possess an X-ray and optical counterpart, so are likely unrelated to the afterglow. The central source #2 has an optical counterpart, while the southernmost source #1 does not have counterparts. The most promising XRT afterglow candidate is thus source #1, although the counterpart of #2 could be the host galaxy of the afterglow. We cannot measure variability at this time, so a secure identification of the afterglow is not possible. Details on the present analysis can be found at: http://www.swift.ac.uk/xrt_products/TILED_GRB00032/ This is an official product of the Swift-XRT team.