{
  "bibcode": "2005GCN..3855....1H",
  "body": "A. Henden (AAVSO/USNO) reports on behalf of the USNO GRB Team:\n\nWe have acquired BVRcIc all-sky photometry for 23x23arcmin\nfields centered on the coordinates of recent GRB localizations\nwith the USNOFS 1.0-m telescope on 1 or 2 photometric nights\nbut with bright moonlight and variable seeing.  Stars brighter\nthan V=12.0 are saturated and should be used with care.  We have\nplaced the photometric data on our anonymous ftp site:\n\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050525.dat\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050607.dat\nftp://ftp.nofs.navy.mil/pub/outgoing/aah/grb/grb050802.dat\n\nThe astrometry in these files is based on linear plate solutions\nwith respect to UCAC2 or USNO-A2.0.  The external errors are usually\n200mas or better.  The estimated external photometric error is\nabout 0.03mag.  Some fields are relatively crowded, and the\nlarge apertures required to handle the variable seeing also\nblended some measurements, so choose comparison stars wisely.\nWe have one additional night for GRB050525 that will be\nadded when reductions are complete.\n\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": 3855,
  "createdOn": 1124724386000,
  "email": "arne@aavso.org",
  "subject": "GRB050525, GRB050607, GRB050802 BVRcIc field photometry",
  "submitter": "Arne A. Henden at AAVSO  <arne@aavso.org>",
  "eventId": "GRB 050525"
}