{
  "bibcode": "2002GCN..1424....1H",
  "body": "A. Henden (USRA/USNO) reports on behalf of the USNO GRB team:\n\nWe have acquired BVRcIc all-sky photometry for\nan 11x11 arcmin field centered at the coordinates\nfor the IPN burst GRB020604 (Hurley et al., GCN 1417)\nwith the USNOFS 1.0-m telescope on one photometric night.  Stars\nbrighter than V=14.0 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/grb020604.dat\nThe astrometry in this file is based on linear plate solutions\nwith respect to UCAC2.  The external errors are less than 100mas.\nThe photometry has potential zeropoint error of about 0.03mag.\nThis is a fairly crowded field, so the automated reduction pipeline\nwill have problems on blended objects.\n\nEditorial note: the NOFS 1.0m has a hard declination limit of\n-31 degrees.  GRB020604 is as far south as we will normally\nobserve, and even then, our potential zeropoint error is\nquite large due to the high airmass.  GRB020405, at -31 dec,\nwas just outside our declination limit.  Therefore, any time\na burst is localized south of -30, you will not see\nfield photometry posted from NOFS.",
  "circularId": 1424,
  "createdOn": 1023827942000,
  "email": "aah@nofs.navy.mil",
  "subject": "GRB020604, BVRcIc field photometry",
  "submitter": "Arne A. Henden at USNO/USRA  <aah@nofs.navy.mil>",
  "eventId": "GRB 020604"
}