{
  "bibcode": "2006GCN..5873....1W",
  "body": "J. Wren, W.T. Vestrand, P.R. Wozniak, R. White, J. Pergande\nof Los Alamos National Laboratory report:\n\nOur autonomous Raptor-S telescope responded to Swift trigger\n240766 (Sbarufatti et al. GCN 5854) at 08:48:17.29 UT, 20.87 s\nafter the trigger and 4.3 s after receiving the GCN packet.\nOur first two images were obtained while the Swift BAT was still\ndetecting emission from the GRB.  We clearly detect a fading\noptical source at the location of the optical counterpart seen\nby the UVOT (Vanden Berk et al. GCN 5856).  Our measurements\nshow that the optical counterpart faded from magnitude R=12.3\nto 14.4 over the first 90 seconds.  Our unfiltered magnitudes\nwere calibrated using the R-band magnitudes from the USNO B1.0\ncatalog.",
  "circularId": 5873,
  "createdOn": 1164660522000,
  "email": "jwren@nis.lanl.gov",
  "subject": "GRB 061126: RAPTOR Optical Detection During Gamma-Ray Emission",
  "submitter": "James Wren at LANL  <jwren@nis.lanl.gov>",
  "eventId": "GRB 061126"
}