GCN Circular 16978
J. A. Kennea (PSU), J. L. Racusin (NASA/GSFC) and C. Pagani (UL) report on behalf of the Swift Team: Swift-XRT has observed the error circle of the Fermi/LAT GRB 141028A in a series of observations tiled on the sky. The total exposure time is 2.0 ks spread over 7 fields; the maximum exposure within the sky observed was 766 s. The observations started 31.0 ks after the Fermi/LAT trigger. Within these data we detect a bright, uncatalogued X-ray source at RA, Dec= 322.60078, -0.23116 which is equivalent to: RA (J2000.0) = 21h 30m 24.19s Dec (J2000.0) = -00d 13' 52.2" with an uncertainty of 5.8 arcsec (radius, 90% confidence). The exposure at this location was 277 s. We note that this source is 4.8 arcsec from the position of the candidate MASTER afterglow position (GCN #16972) which has been confirmed to be fading by GROND (GCN #16977), and does not match any previously catalogued source. The source is significantly brighter than the RASS limit and therefore we suggest that this is the X-ray afterglow of GRB 141028A. More observations will be required to determine if the source is fading in X-rays. The results of the automatic processing for this source are available at http://www.swift.ac.uk/xrt_products/TILED_GRB00030/index_4.php This circular is an official product of the Swift-XRT team.