{
  "bibcode": "2007GCN..6909....1H",
  "body": "A. Henden (AAVSO) reports:\n\nWhile the field of GRB071010B has been observed by SDSS, we have also\nobtained a two-night BVRcIc field calibration using the 35cm robotic\ntelescope at Sonoita Research Observatory.  The calibration file\nhas a limiting magnitude around V=18, with good standards brighter\nthan V=16 or so.  The file is available at\nftp://ftp.aavso.org/public/calib/grb/grb071010b.dat\n\nThis calibration is based on numerous Landolt standards, and has\nan external zeropoint error of about 0.02mag. We do not expect\nat this time to extend this calibration to fainter magnitudes.\n\nThe AAVSO thanks the Curry Foundation for their continued support of the\nAAVSO International High Energy Network.",
  "circularId": 6909,
  "createdOn": 1192290406000,
  "email": "arne@aavso.org",
  "subject": "GRB071010B, BVRcIc field calibration",
  "submitter": "Arne A. Henden at AAVSO  <arne@aavso.org>",
  "eventId": "GRB 071010B"
}