{
  "subject": "GRB 141207A: Swift-XRT observations",
  "eventId": "GRB 141207A",
  "bibcode": "2014GCN.17149....1A",
  "createdOn": 1418053531000,
  "circularId": 17149,
  "submitter": "Alex Amaral-Rogers at U.of Leicester  <aar14@leicester.ac.uk>",
  "email": "aar14@leicester.ac.uk",
  "body": "A. Amaral-Rogers & P.A. Evans (U. Leicester) report on behalf of the\nSwift-XRT team:\n\nWe have observed the area around the Fermi-LAT GRB 141207A (Arimoto et\nal., 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,\n3.8933, which is equivalent to:\n\nRA (J2000)  = 10h 40m 15.34s\nDec (J2000) = +03d 53' 35.9\"\n\nwith an uncertainty of 5.2\" (radius, 90% confidence). Although this\nsource is uncatalogued, it is a factor of 3 below the ROSAT limit at\nthis location, with a 0.3-10 keV flux of 1.7e-13 erg/cm^2/s. We expect\n~0.9 sources at this flux to be serendipitously present in our XRT\nobservations, therefore we caution that this may not be the afterglow.\nWe cannot currently tell whether the source is fading, but follow-up\nobservations are planned.\n\nThere is a second uncatalogued X-ray source present in the data, at\nRA,Dec=159.8172, 4.0930 with an uncertainty of 6.5\"; however this source\nis coincident with the object [VV2006] J103916.6+040536 which SIMBAD\nclassifies as a quasar, thus it is unlikely to be the GRB afterglow.\n\nThis circular is an official product of the Swift-XRT team."
}