{
  "bibcode": "2009GCN.10036....1S",
  "body": "B. E. Schaefer (Louisiana State) and S. B. Pandey (U Mich), report on\nbehalf of the ROTSE collaboration:\n\nROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,\nresponded to GRB 091018 (Swift trigger 373172, Stamatikos et al., GCN\n10034). The first image was at 20:57:36.1 UT, 556.6 s after the burst\n(11.1 s after the GCN notice time).  The unfiltered images are calibrated\nrelative to USNO A2.0. We detect a new object, not visible in the DSS\n(second epoch), with coordinates:\n\n     02:08:44.6      -57:32:53.6    (J2000), \n\nwith positional uncertainty of 1\" or better\n\nstart UT    \tmag     mlim(of image)\n----------------------------------\n20:57:36.1     15.4     16.4 \n\n\nWith this, we confirm the optical afterglow reported in GCN 10034 as a\nUVOT detection.  The source is rapidly fading.  A jpeg image is available \nat\nhttp://www.rotse.net/images/gsb373172_3c01_img.jpg Note that the object\nnumbered 14 (in the lower of the two circles) is the candidate in\nquestion.\n\nContinuing observations are in progress.",
  "circularId": 10036,
  "createdOn": 1255901672000,
  "email": "schaefer@grb.phys.lsu.edu",
  "subject": "GRB 091018: ROTSE-III Detection of Optical Counterpart",
  "submitter": "Brad Schaefer at LSU  <schaefer@grb.phys.lsu.edu>",
  "eventId": "GRB 091018"
}