TITLE: GCN CIRCULAR NUMBER: 17149 SUBJECT: GRB 141207A: Swift-XRT observations DATE: 14/12/08 15:45:31 GMT FROM: Alex Amaral-Rogers at U.of Leicester A. Amaral-Rogers & P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team: We have observed the area around the Fermi-LAT GRB 141207A (Arimoto et al., GCN Circ. 17146), in 4 XRT fields starting at 07:59:28 UT, 12 hours and 48 minutes after Fermi/LAT detection. With 1.3-1.7 ks per field, we find an uncatalogued X-ray source at a position of RA,Dec=160.0639, 3.8933, which is equivalent to: RA (J2000) = 10h 40m 15.34s Dec (J2000) = +03d 53' 35.9" with an uncertainty of 5.2" (radius, 90% confidence). Although this source is uncatalogued, it is a factor of 3 below the ROSAT limit at this location, with a 0.3-10 keV flux of 1.7e-13 erg/cm^2/s. We expect ~0.9 sources at this flux to be serendipitously present in our XRT observations, therefore we caution that this may not be the afterglow. We cannot currently tell whether the source is fading, but follow-up observations are planned. There is a second uncatalogued X-ray source present in the data, at RA,Dec=159.8172, 4.0930 with an uncertainty of 6.5"; however this source is coincident with the object [VV2006] J103916.6+040536 which SIMBAD classifies as a quasar, thus it is unlikely to be the GRB afterglow. This circular is an official product of the Swift-XRT team.