{
  "bibcode": "2007GCN..6445....1U",
  "body": "A. C. Updike, J. R. Puls, and D. H. Hartmann (Clemson University) report \non behalf of the Clemson GRB Follow-Up Team:\n\nWe imaged the field of GRB 070521 (GCN 6431, Guidorzi et al.) beginning \n14 minutes after the trigger (279935) with the SARA 0.9m at Kitt Peak \nunder decent weather conditions.  In 50 minutes of stacked exposures in \nthe R band, we detect no new sources in the XRT error circle down to a \nlimiting magnitude of 20 +/- 0.4.  We do not detect the source noted by \nHattori et al. (GCN 6444).  This magnitude is based on calibration to 5 \nUSNO B1.0 stars.\n\nThe SARA Homepage can be found at:\n http://saraobservatory.org\n\nThis message may be cited.",
  "circularId": 6445,
  "createdOn": 1179793291000,
  "email": "aupdike@clemson.edu",
  "subject": "GRB 070521: SARA upper limit",
  "submitter": "Adria C. Updike at Clemson U  <aupdike@clemson.edu>",
  "eventId": "GRB 070521"
}