{
  "bibcode": "2014GCN.15959....1E",
  "body": "P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the \nSwift-XRT team:\n\nUsing 1977 s of XRT Photon Counting mode data and 4 UVOT\nimages, we find an astrometrically corrected X-ray position (using the\nXRT-UVOT alignment and matching UVOT field sources to the USNO-B1\ncatalogue): RA, Dec =\n209.30516, 0.64193 which is equivalent to:\n\nRA (J2000):  13 57 13.24\nDec (J2000): +00 38 31.0\n\nwith an uncertainty of 1.8 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received.  The latest\nposition can be viewed at http://www.swift.ac.uk/xrt_positions. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans\net al. (2009, MNRAS, 397, 1177).\n\nThis position is 0.5 arc sec from the optical counterpart reported by\nXu et al (GCN Circ. 15947), thus we believe this is the X-ray afterglow.\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 15959,
  "createdOn": 1394618211000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 140311A: Enhanced Swift-XRT position",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 140311A"
}