{
  "bibcode": "2013GCN.14477....1K",
  "body": "D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ),\nS. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)\nand N. Kawai(Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 130427B (Maselli et al., GCNC 14460)\nwith the optical three color (g', Rc and Ic) CCD camera attached\nto the MITSuME 50cm telescope of Okayama Astrophysical Observatory.\n\nThe observation started on 2013-04-27 18:47:30 UT (~5.4 h after the burst).\nWe did not find any new point source within the enhanced XRT circle\n(Osborne et al., GCNC 14467) in all the three bands.\n\nPhotometric results of the OT are listed below.\nWe used GSC2.3 catalog for flux calibration.\n\n#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic\n-----------------------------------------------------\n0.22892    18:50:19    2160.0   >18.0  >18.3  >17.9\n-----------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 14477,
  "createdOn": 1367108928000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB 130427B: MITSuME Okayama upper limits",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 130427B"
}