{
  "bibcode": "2013GCN.14889....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 MITSuME and OISTER collaboration:\n\nWe observed the field of GRB 130612A (Racusin et al., GCNC 14874)\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 2013-06-12 11:27:22 UT (~8.08 h after the burst).\nWe could not detect the previously reported afterglow\n(Racusin et al., GCNC 14874; Melandri et al., GCNC 14875) in all the three bands.\n\nThree sigma upper limits of the OT are listed below.\nWe used GSC 2.3 catalog for flux calibration.\n\n#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic\n-----------------------------------------------------\n0.43348    13:46:34    7800.0   >20.2  >20.2  >19.4\n-----------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 14889,
  "createdOn": 1371063602000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB 130612A: MITSuME Okayama upper limits",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 130612A"
}