{
  "bibcode": "2007GCN..7119....1Y",
  "body": "M. Yoshida, K. Yanagisawa, Y. Shimizu, S. Nagayama, H. Toda (OAO, NAOJ)\nand N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:\n\nWe performed optical imaging observations (g', Rc and Ic) of the field\nof GRB 071118 (Cummings et al., GCN 7106; Markwardt et al. GCN 7109)\nwith 50cm MITSuME telescope at Okayama Astrophysical Observatory from UT\n9:00:31 (194 sec after the trigger) to UT 13:03 on November 18 2007.\n\nWe found a fading source at the position in the XRT error circle\nreported by Moretti et al. (GCN 7111) in Rc and Ic bands. We made flux\ncalibration using NOMAD (for g' and Rc) and USNO B1.0 (for Ic) catalogs.\nThe photometric results are following.\n\n   mid-UT            exp-T   g'     Rc         Ic\n---------------------------------------------------------\n2007-11-18  9:03:22   5min   >16.9  18.5+-0.5  >17.8\n2007-11-18 10:12:12  25min   >19.1  19.1+-0.3  18.5+-0.3\n2007-11-18 11:16:35  45min   >20.0  20.2+-0.3  19.7+-0.3\n2007-11-18 12:33:20  57min   >20.3  20.7+-0.4  >20.2\n---------------------------------------------------------",
  "circularId": 7119,
  "createdOn": 1195526634000,
  "email": "yoshida@oao.nao.ac.jp",
  "subject": "GRB071118 MITSuME OAO optical observation",
  "submitter": "Michitoshi Yoshida at Okayama Astrophysical Obs  <yoshida@oao.nao.ac.jp>",
  "eventId": "GRB 071118"
}