{
  "bibcode": "2007GCN..6944....1U",
  "body": "Adria C. Updike, Brian Donehew, Paul Jay Searcy, Ernest Garrison, and \nDieter H. Hartmann report (on behalf of the Clemson GRB Follow-Up Team):\n\nWe observed the field of GRB 071018 (GCN 6932, Krimm et al.) beginning \n1.05 days after the trigger under good weather conditions.  We obtained \n69 minutes of R-band images at high airmass.\n\nUpon comparison to the sources identified by Xin et al. (GCN 6936), we \nfind a magnitude of 20.5 � 0.15 for OT candidate #1.  We note that this \nis brighter than the magnitude reported by Xin et al. half a day \nearlier, so this may indeed be a variable source. \n\nWe also note a source in SDSS images at the location of GCN 6936 OT \ncandidate #2.\n\nAt the locations of the XRT error circles (GCN 6943, Beardmore et al.), \nwe detect no new sources down to a limiting magnitude of 20.8 in the R \nband.\n\nCalibration to the USNO B1.0 catalog was done relative to 10 field stars.\n\nWe would like to thank Liping Xin for providing a finder chart and \nadditional information on their observations.  We also acknowledge the \nhelp of Kenneth Rumstay (Valdosta U).\n\nThis message may be cited.",
  "circularId": 6944,
  "createdOn": 1192822137000,
  "email": "aupdike@clemson.edu",
  "subject": "GRB 071018: SARA observations",
  "submitter": "Adria C. Updike at Clemson U  <aupdike@clemson.edu>",
  "eventId": "GRB 071018"
}