{
  "bibcode": "2013GCN.14177....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 made observations of Swift\ntrigger 547407 (Grupe, et al., GCN 14156).  The burst location was within\nthe field of our wide-field monitor located in Maui, HI, which began a 10 s\nintegration of the location at 13:56:20.65 UT, 1.4 s before the Swift trigger\ntime and during the gamma-ray emitting interval.  During the period that the\nBAT was detecting gamma-ray emission, from ~T-5 s to ~T+65 s (Palmer,\net al., GCN 14163), we have a total of four 10 s exposures with limiting\nmagnitudes of R~9.4 in moderate moonglow.  We do not detect the optical\ncounterpart (Tanvir et al., GCN 14157; Virgili et al., GCN 14158) in any of\nour images.  Our 3-sigma limiting magnitudes are based on a comparison of\nour unfiltered image to the Tycho-2 V-band catalog.",
  "circularId": 14177,
  "createdOn": 1359746585000,
  "email": "jwren@nis.lanl.gov",
  "subject": "GRB 130131A: RAPTOR Limits During Gamma-Ray Emitting Interval",
  "submitter": "James Wren at LANL  <jwren@nis.lanl.gov>",
  "eventId": "GRB 130131A"
}