{
  "bibcode": "2008GCN..7631....1H",
  "body": "A. Henden (AAVSO) reports:\n\nWhile the field of GRB080310 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=17, with good standards brighter\nthan V=11 or so.  The file is available at\nftp://ftp.aavso.org/public/calib/grb/grb080310.dat\n\nThis calibration is based on numerous Landolt standards, and has\nan external zeropoint error of about 0.02mag. 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, and to John Gross of SRO for\nproviding setup assistance for this field.",
  "circularId": 7631,
  "createdOn": 1208614669000,
  "email": "arne@aavso.org",
  "subject": "GRB080310, BVRcIc field calibration",
  "submitter": "Arne A. Henden at AAVSO  <arne@aavso.org>",
  "eventId": "GRB 080310"
}