{
  "bibcode": "2015GCN.18253....1B",
  "body": "A.P. Beardmore, P.A. Evans, M.R. Goad and J.P. Osborne (U. Leicester) \nreport on behalf of the Swift-XRT team.\n\nUsing 3059 s of XRT Photon Counting mode data and 4 UVOT\nimages for GRB 150907B, we find an astrometrically corrected X-ray\nposition (using the XRT-UVOT alignment and matching UVOT field sources\nto the USNO-B1 catalogue): RA, Dec = 255.30407, -63.78510 which is equivalent\nto:\n\nRA (J2000): 17h 01m 12.98s\nDec (J2000): -63d 47' 06.4\"\n\nwith an uncertainty of 1.9 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 circular was automatically generated, and is an official product of the\nSwift-XRT team.",
  "circularId": 18253,
  "createdOn": 1441693632000,
  "email": "pae9@leicester.ac.uk",
  "subject": "GRB 150907B: Enhanced Swift-XRT position",
  "submitter": "Phil Evans at U of Leicester  <pae9@leicester.ac.uk>",
  "eventId": "GRB 150907B"
}