{
  "bibcode": "2001GCN..1197....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 that is approximately centered on\nthe position of the candiate optical transient reported\nby Grav et al. (GCN 1191) with the USNOFS 1.0-m telescope\non one photometric (but poor seeing) night.  Stars brighter than\nV=13.5 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/grb011211.dat\nThe current photometry has a potential external zero-point\nerror of about two percent.  The astrometry in this file\nis based on linear plate solutions with respect to USNO-A2.0.\nThe internal errors are less than 100mas.\n\nIn particular, the comparison star U0675_11427359 that was\nused to calibrate their field can be found in the .dat file\nwith the following magnitudes:\n  B = 18.65  V = 18.11  R = 17.76  I = 17.42\nwith estimated photometric errors of about 4 percent, including\nthe zeropoint errors quoted above.\n\nFurther calibration of this field will be performed when\nweather conditions improve.",
  "circularId": 1197,
  "createdOn": 1008264164000,
  "email": "aah@nofs.navy.mil",
  "subject": "GRB011211, BVRI field photometry",
  "submitter": "Arne A. Henden at USNO/USRA  <aah@nofs.navy.mil>",
  "eventId": "GRB 011211"
}