{
  "bibcode": "2011GCN.12273....1E",
  "body": "P.A. Evans & J.P. Osborne (U. Leicester) report,\n\nFollowing the revision to the enhanced XRT GRB positions (GCN 12250),\nthose for GRBs between 2005 July and 2006 April only were found to\nbe have been degraded in the Aug 5 reprocessing. This was due to the use\nof an inappropriate alignment calibration file in the standard pipeline\nprocessing for this interval. We have now recalculated the positions\nwith the correct files, see http://www.swift.ac.uk/reprocessed.php for \ndetails. We thank Daniele Malesani for alerting us and providing \nadditional optical positions to enable improved calibration and testing.",
  "circularId": 12273,
  "createdOn": 1313069711000,
  "email": "pae9@star.le.ac.uk",
  "subject": "Reprocessed enhanced Swift-XRT positions and GRB products: update",
  "submitter": "Phil Evans at U of Leicester  <pae9@star.le.ac.uk>"
}