{
  "bibcode": "2007GCN..6734....1S",
  "body": "H. Swan (U Mich), B. E. Schaefer (Louisiana State), E.S. Rykoff (U \nMich), report on behalf of the ROTSE collaboration:\n\nROTSE-IIIb, located at McDonald Observatory, Texas, responded to GRB \n070810 (Swift trigger 287364). The first image was at 02:34:02.5 UT, \n1330.5 s after the burst. The unfiltered images are calibrated relative \nto USNO A2.0. We detect a 16.7 magnitude, fading source with coordinates:\n\n      12:39:51.48      +10:45:00.90    (J2000).\n\nThe source is blended with a nearby USNO star visible in the DSS, and \nthus our initial positional uncertainty is ~3\".\n\nstart UT    \tmag     mlim(of image)\n----------------------------------\n02:29:53.4     16.7     18.5\n\n\nThis source is not visible in DSS (second epoch), 2MASS or the MPChecker \ndatabase.\n\nA jpeg image is available at \nhttp://www.rotse.net/images/gsb0174_3b01_img.jpg\n\nContinuing observations are in progress.",
  "circularId": 6734,
  "createdOn": 1186715523000,
  "email": "hflewell@umich.edu",
  "subject": "GRB 070810: ROTSE-III Detection of Optical Counterpart",
  "submitter": "Heather Swan at U.of Michigan/ROTSE  <hflewell@umich.edu>",
  "eventId": "GRB 070810"
}