{
  "bibcode": "2008GCN..8337....1W",
  "body": "J. Wren, W.T. Vestrand, P.R. Wozniak, H. Davis, B. Norman\nof Los Alamos National Laboratory report:\n\nThe RAPTOR telescope system responded to Swift trigger\n330856 (Baumgartner et al., GCN 8330) under fair observing conditions.\nOur narrow-field instruments began observing the location at\n05:24:17.13 UTC, 24.4 s after the Swift trigger and during the end\nof the Gamma-Ray emitting interval.  We detect the optical counterpart\nreported by Baumgartner et al. (GCN 8330) and Covino et al. (GCN 8331).\nWe first detect the counterpart at R~16.4 at approximately 90s after\nthe Swift trigger time.  The counterpart brightens over the next 50\nseconds to magnitude R~15.4 and then begins fading steadily.  Our\nunfiltered images were calibrated against the USNO-B1 R-band.  The\nfollowing table gives selected observations, not corrected for\nextinction, from this event.\n\nt-mid(s)    exp(s)     mag     mag-err\n--------------------------------------------\n90.31        5.0      16.43    0.22\n139.58      10.0      15.38    0.06\n367.83      30.0      16.75    0.20\n685.42      30.0      17.28    0.19",
  "circularId": 8337,
  "createdOn": 1223409405000,
  "email": "jwren@nis.lanl.gov",
  "subject": "GRB 081007: Early RAPTOR measurements of optical counterpart",
  "submitter": "James Wren at LANL  <jwren@nis.lanl.gov>",
  "eventId": "GRB 081007"
}