{
  "subject": "GRB 140215A: RAPTOR Observations During Gamma-Ray Emitting Interval",
  "eventId": "GRB 140215A",
  "bibcode": "2014GCN.15861....1W",
  "createdOn": 1392824154000,
  "circularId": 15861,
  "submitter": "James Wren at LANL  <jwren@nis.lanl.gov>",
  "email": "jwren@nis.lanl.gov",
  "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 made follow-up observations\nof Swift trigger 586680 (Markwardt, et al., GCN 15837).  Our narrow-field\ninstruments in Los Alamos, NM, began imaging at 04:07:37.21 UT,\n26.9 seconds after the BAT trigger time.  We do not detect the counterpart\nin our three initial images, with limiting magnitudes near 14.0.  The\ncounterpart then rises above our detection limit and reaches peak brightness\nat magnitude 13.5 around T-Tbat=90s.  The counterpart then plateaus for\na period of about 50 seconds before beginning a power-law decay.  Our\nunfiltered observations were calibrated to the USNO-B1 R-band.  The following\ntable summarizes some of our early observations.\n\nt-mid(s)    exp(s)    mag     error\n------------------------------------\n29.45       5      >14.0\n56.85       5      13.8287    0.033\n83.85       5      13.5381    0.011\n128.95      10     13.5608    0.008\n283.35      10     14.3725    0.024\n470.75      30     14.9185    0.020"
}