{
  "bibcode": "2012GCN.13263....1K",
  "body": "D. Kuroda (OAO, NAOJ),  H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ),\nK. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima),\nK. Ohta (Kyoto) and N. Kawai(Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 120422A (Troja et al., GCNC 13243)\nwith the optical three color (g', Rc and Ic) CCD camera attached\nto the Murikabushi 1m telescope of Ishigakijima Astronomical\nObservatory.\n\nThe observation started on 2012-04-22 13:03:25 UT (~5.9 h after the\nburst). We could not detect the previously reported afterglow\n(Cucchiara et al., GCNC 13245) in all the three bands.\n\nThree sigma upper limits of the OT are listed below.  We used SDSS catalog\nfor flux calibration.\n\n#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc     Ic\n----------------------------------------------------------------------\n0.27008    13:40:57   2880.0    >21.5   >21.3  >19.5\n----------------------------------------------------------------------\nT0+ : Elapsed time after the burst [day]\nT-EXP: Total Exposure time [sec]",
  "circularId": 13263,
  "createdOn": 1335453607000,
  "email": "dikuroda@oao.nao.ac.jp",
  "subject": "GRB 120422A: MITSuME Ishigakijima upper limit",
  "submitter": "Daisuke Kuroda at OAO/NAOJ  <dikuroda@oao.nao.ac.jp>",
  "eventId": "GRB 120422A"
}