{
  "bibcode": "2005GCN..3454....1H",
  "body": "A. Henden (AAVSO/USNO) reports on behalf of the USNO GRB Team:\n\nWe have acquired BVRcIc all-sky photometry for 11x11arcmin\nfields centered on the coordinates of recent GRB localizations\nwith the USNOFS 1.0-m telescope on one photometric night\nbut with bright moonlight.  Stars brighter than V=12.0\nare saturated and should be used with care.  We have placed\nthe photometric data on our anonymous ftp site:\n\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050319.dat\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050401.dat\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050408.dat\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050416.dat\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050502a.dat\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050509b.dat\n\nThe astrometry in these files is based on linear plate solutions\nwith respect to UCAC2.  The external errors are less than 100mas.\nThe estimated external photometric error is about 0.03mag.\n\nSince these bursts had identified optical afterglows, we expect\nto improve the photometric calibration on subsequent nights.\nAs always, you should check the dates on the .dat file prior to\nfinal publication to get the latest photometry.  There is\na README file on the ftp directory to give you information\nabout the procedures used to calibrate these fields.",
  "circularId": 3454,
  "createdOn": 1116796675000,
  "email": "arne@aavso.org",
  "subject": "Recent GRB BVRcIc field photometry",
  "submitter": "Arne A. Henden at AAVSO  <arne@aavso.org>"
}