{
  "bibcode": "2017GCN.22218....1D",
  "body": "P. D���Avanzo, A. Melandri (INAF-OAB), J. A. Kennea (PSU), P.A. Evans \nand M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team:\n\nUsing 2454 s of XRT Photon Counting mode data and 6 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 = 139.40280, -30.52016 which is equivalent to:\n\nRA (J2000):  09 17 36.67\nDec (J2000): -30 31 12.6\n\nwith an uncertainty of 1.7 arcsec (radius, 90% confidence).\n\nThis position is consistent with the one reported for the Swift/UVOT \ncandidate (LaPorte et al., GCN 22213). \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 <http://www.swift.ac.uk/xrt_positions>. Position\nenhancement is described by Goad et al. (2007, A&A, 476, 1401) and \nEvans et al. (2009, MNRAS, 397, 1177).\n\nThis circular is an official product of the Swift-XRT team.",
  "circularId": 22218,
  "createdOn": 1512849435000,
  "email": "paolo.davanzo@brera.inaf.it",
  "subject": "GRB 171209A: Enhanced Swift-XRT position",
  "submitter": "Paolo D'Avanzo at INAF-OAB  <paolo.davanzo@brera.inaf.it>",
  "eventId": "GRB 171209A"
}