{
  "bibcode": "2003GCN..1948....1H",
  "body": "A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:\n\nWe have acquired BVRcIc all-sky photometry for\na 20x20 arcmin field centered at the coordinates\nfor the HETE burst GRB030323 (HETE trigger 2640)\nwith the USNOFS 1.0-m telescope on one very marginal\nphotometric night.  Stars brighter than V=13.5 are saturated and\nshould be used with care.  We have placed the photometric data\non our anonymous ftp site:\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb030323.dat\nThe astrometry in this file is based on linear plate solutions\nwith respect to UCAC2.  The external errors are less than 100mas.\nThere were approaching clouds from a weak frontal system\nthat do not appear to have reached this field until well\nafter the observations, but until further calibration\nis performed, a systematic error is possible.  Based purely\non the standard star observations, the estimated external\nphotometric error is 0.03mag.\n\nIf an OT is discovered, this calibration will be extended\nwith additional nights.  We will not be performing U-band\ncalibration unless requested.  As always, you should check\nthe dates on the .dat file prior to final publication to get\nthe latest photometry.",
  "circularId": 1948,
  "createdOn": 1048531574000,
  "email": "aah@nofs.navy.mil",
  "subject": "GRB030323, BVRcIc field calibration",
  "submitter": "Arne A. Henden at USNO/USRA  <aah@nofs.navy.mil>",
  "eventId": "GRB 030323"
}