{
  "bibcode": "2003GCN..1917....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 optical transient (Castro-Tirado et al., GCN 1904)\nassociated with the INTEGRAL burst GRB030227 (Gotz et al.,\nGCN 1895, 1896) with the USNOFS 1.0-m telescope on one\nphotometric night.  Stars brighter than V=13.5 are saturated\nand should be used with care.  We have placed the photometric\ndata on our anonymous ftp site:\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb030227.dat\nThe astrometry in this file is based on linear plate solutions\nwith respect to UCAC2.  The external errors are less than 100mas.\nThe estimated external photometric error is 0.03mag.\n\nThis calibration will be extended with additional nights to\nensure against a systematic zeropoint error, but current\nweather forecasts indicate that this may be a week or two.\nWe will not be performing U-band calibration unless requested.\nAs always, you should check the dates on the .dat file prior\nto final publication to get the latest photometry.",
  "circularId": 1917,
  "createdOn": 1046715620000,
  "email": "aah@nofs.navy.mil",
  "subject": "GRB030227, BVRcIc field photometry",
  "submitter": "Arne A. Henden at USNO/USRA  <aah@nofs.navy.mil>",
  "eventId": "GRB 030227"
}