{
  "bibcode": "2001GCN..1025....1H",
  "body": "A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:\n\n  We have acquired shallow BVRcIc all-sky photometry for\nan 11x11 arcmin field that covers the BeppoSAX\nerror circle for GRB010220 (GCN 956) with the USNOFS 1.0-m telescope\non one marginally photometric night.  Stars brighter than\nV=13 are saturated and should be used with care.\nWe have placed the photometric data on our anonymous ftp site:\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb010220.dat\nThe current photometry has a potential external zero-point\nerror of about three percent.  The astrometry in this file\nis based on linear plate solutions with respect to USNO-A2.0.\nThe internal errors are less than 100mas.  Crowding will\nyield some unphysical stars due to astrometric and photometric\nblends.\n  Further calibration of this field will not be performed this\nseason as the field is disappearing into twilight.",
  "circularId": 1025,
  "createdOn": 985806777000,
  "email": "aah@nofs.navy.mil",
  "subject": "GRB010220, field photometry",
  "submitter": "Arne A. Henden at USNO/USRA  <aah@nofs.navy.mil>",
  "eventId": "GRB 010220"
}