{
  "bibcode": "2008GCN..7528....1H",
  "body": "A. Henden (AAVSO) reports:\n\nWhile the field of GRB080319B has been observed by SDSS, we have also\nobtained a four-night BVRcIc field calibration using the 35cm robotic\ntelescope at Sonoita Research Observatory.  The calibration file\nhas a limiting magnitude around V=16, with good standards brighter\nthan V=11 or so.  The file is available at\nftp://ftp.aavso.org/public/calib/grb/grb080319b.dat\n\nThis calibration is based on numerous Landolt standards, and has\nan external zeropoint error of about 0.02mag. We are continuing\ncalibration of this field, moving to the west to pick up the\n9th magnitude star SAO 64192, and will extend the calibration\nfile when that photometry is available.  Our system is available\nfor any other bright BVRI calibrations (4<V<19) for this field or any\nother field; contact the author for such requests.\n\nThe AAVSO thanks the Curry Foundation for their continued support of the\nAAVSO International High Energy Network.",
  "circularId": 7528,
  "createdOn": 1206707987000,
  "email": "arne@aavso.org",
  "subject": "GRB080319B, BVRcIc field calibration",
  "submitter": "Arne A. Henden at AAVSO  <arne@aavso.org>",
  "eventId": "GRB 080319B"
}