{
  "bibcode": "2012GCN.13753....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 120911A (Cannizzo et al., GCNC 13744)\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 2012-09-11 13:46:32 UT, (~6.6 h after the burst).\nWe did not find any new point source within the enhanced XRT circle\n(Beardmore et al., GCNC 13748) in all the three bands.\n\n\nThree sigma upper limits of the OT are listed below. We used\nGSC2.3 catalog for flux calibration.\n\nT0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic\n------------------------------------------------------\n0.31808    14:46:35    5940.0   >20.6  >19.8  >19.2\n------------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 13753,
  "createdOn": 1347430699000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB120911A: MITSuME Okayama Optical upper limits",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 120911A"
}