{
  "bibcode": "2005GCN..3867....1S",
  "body": "B. E. Schaefer (Louisiana State), Fang Yuan (U Mich), and K. Alatalo\n(Berkeley)  report on behalf of the ROTSE collaboration:\n\nROTSE-IIIc, located at the H.E.S.S. site at Mt. Gamsberg, Namibia,\nresponded to GRB 050824 (Swift trigger 151905), producing images beginning\n7.1 s after the GCN notice time. An automated response took the first\nimage at 23:22:02.1 UT, 585.8 s after the burst, under good conditions\nalthough with the gibbous Moon only 25 degrees away. We took 10 5-sec, 10\n20-sec and 130 60-sec eposures. These unfiltered images are calibrated\nrelative to USNO A2.0 (R).\n\nROTSE-IIId, located at the Turkish National Observatory at Bakirlitepe,\nTurkey, also responded, producing images beginning 5.8 s after the GCN\nnotice time. An automated response took the first image at 23:22:00.8 UT,\n584.5 s after the burst, under good conditions (but again, with the\ngibbous Moon nearby). We took 10 5-sec, 10 20-sec and 80 60-sec eposures.\nThese unfiltered images are also calibrated relative to USNO A2.0 (R).\n\nComparison to the DSS (second epoch) reveals no new sources within the \n3-sigma error circle, for both single images and coadding into sets of 10. \nIndividual images have limiting magnitudes ranging from 15.4-17.0; we set \nthe following specific limits.\n\nROTSE  start UT       end UT     t_exp(s)   mlim   t_start-tGRB(s)  Coadd?\n--------------------------------------------------------------------------\nIII-c  23:22:02.1   23:23:27.1       85     17.3          585.8       Y\nIII-c  23:23:27.7   23:28:21.7      294     18.2          671.4       Y\nIII-d  23:22:00.8   23:24:20.8      140     17.4          584.5       Y\nIII-d  23:24:21.5   23:29:20.5      299     17.9          725.2       Y\n\nIn particular, we do not see the new source described by Gorosabel et al. \n(GCN 3865), with this source being near or below our detection threshold.",
  "circularId": 3867,
  "createdOn": 1124935111000,
  "email": "schaefer@grb.phys.lsu.edu",
  "subject": "GRB 050824: ROTSE-III Optical Limits",
  "submitter": "Brad Schaefer at LSU  <schaefer@grb.phys.lsu.edu>",
  "eventId": "GRB 050824"
}