{
  "bibcode": "2012GCN.12803....1W",
  "body": "J. Wren, W. T. Vestrand, P. Wozniak, and H. Davis\nof Los Alamos National Laboratory report:\n\nThe RAPTOR network of robotic optical telescopes responded to Swift trigger\n510341 (GRB 111225A, Siegel et al., GCN 12720).  Unfiltered observations of\nthe source location began at 03:51:27.2 UTC, 49.4 seconds after the BAT\ntrigger time.  The initial short exposures during the first two mintues of our\nresponse sequence do not clearly show the counterpart.  However, stacking\nthose images, 8 5-second exposures taken between 03:51:37.6 UTC and\n03:52.46.0 UTC, gives a 5-sigma detection at counterpart location\n(Klotz et al., GCN 12722, and Updike et al., GCN 12723).  Based on\ncomparison to the USNO-B1 R-band, the measured brightness is R~18.7 +\\- 0.3\nat a t-mid of 03:52:12 UTC, 94 seconds after the Swift BAT trigger.",
  "circularId": 12803,
  "createdOn": 1325639703000,
  "email": "jwren@nis.lanl.gov",
  "subject": "GRB111225A: RAPTOR Early Detection of the Optical Counterpart",
  "submitter": "James Wren at LANL  <jwren@nis.lanl.gov>",
  "eventId": "GRB 111225A"
}