{
  "bibcode": "2008GCN..7886....1Y",
  "body": "M. Yoshida, K. Yanagisawa, Kuroda, D., Y. Shimizu, S. Nagayama,\nToda, H. (OAO, NAOJ) and N. Kawai (Tokyo Tech) report on behalf\nof the MITSuME collaboration:\n\nWe performed optical imaging observation (g', Rc, and Ic) of the\nfield of GRB 080613B (Markwardt et al. GCN 7873) with 50cm MITSuME\ntelescope at Okayama Astrophysical Observatory from 11:19:09 UT\n(6m 31s after the trigger) to UT 12:43:30 on June 13 2008.\n\nWe could not identify any new source in the XRT error circle\n(Mao et al. GCN7875). Three sigma limiting magnitudes of our\nobservation are listed below.\n\n\nObservation date: 2008-06-13 UT\n\nStart-UT   mid-UT    exp-T    g'      Rc      Ic\n----------------------------------------------------\n11:19:09   11:31:16  10min    >18.4   >18.3   >18.0\n11:31:26   12:07:28  60min    >18.7   >18.4   >18.1\n----------------------------------------------------",
  "circularId": 7886,
  "createdOn": 1213745623000,
  "email": "yoshida@oao.nao.ac.jp",
  "subject": "GRB080613B: MITSuME upper limits",
  "submitter": "Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida@oao.nao.ac.jp>",
  "eventId": "GRB 080613B"
}