{
  "bibcode": "2009GCN..8796....1E",
  "body": "P.A. Evans, M.R. Goad, J.P. Osborne and A.P. Beardmore (U. Leicester) \nreport on behalf of the Swift-XRT team.\n\nUsing 1667 s of XRT Photon Counting mode data and 2 UVOT\nimages for GRB 090111, 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 = 251.67557, +0.07728 which is equivalent\nto:\n\nRA (J2000): 16h 46m 42.14s\nDec (J2000): +00d 04' 38.2\"\n\nwith an uncertainty of 1.7 arcsec (radius, 90% confidence).\n\nThis position may be improved as more data are received. The latest position\ncan be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is\ndescribed by Goad et al. (2007, A&A, 476, 1401\nhttp://www.swift.ac.uk/xrt_positions/Goad.pdf), the current algorithm is an\nextension of this method.\n\nThis circular was automatically generated, and is an official product of the\nSwift-XRT team.",
  "circularId": 8796,
  "createdOn": 1231735277000,
  "email": "pae9@star.le.ac.uk",
  "subject": "GRB 090111: Enhanced Swift-XRT position",
  "submitter": "Phil Evans at U of Leicester  <pae9@star.le.ac.uk>",
  "eventId": "GRB 090111"
}