{
  "bibcode": "2014GCN.17215....1Y",
  "body": "Y. Yano, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi,\nS. Kurita, Y. Ono, T. Fujiwara, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 141220A (J. R. Cummings et al., GCN Circular #17196) with the\noptical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm\ntelescope of Akeno Observatory, Yamanashi, Japan.\n\nThe observation started on 2014-12-20 15:16:22 UT (~9.2 h after the burst).\nWe did not find any new point source within the refined XRT error circle \n(B. P. Gompertz., GCN Circular #17203) in all the three bands.\n\nThe measured magnitudes are listed below.\n\nT0+[sec]     MID-UT    T-EXP[sec]        g'         Rc        Ic\n-----------------------------------------------------------------------------\n36707        18:07:29        8460          >21.4  >20.8  >20.4\n-----------------------------------------------------------------------------\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used GSC2.3 catalog for flux calibration.",
  "circularId": 17215,
  "createdOn": 1419232008000,
  "email": "yoshii.t.ac@m.titech.ac.jp",
  "subject": "GRB 141220A: MITSuME Akeno upper limits",
  "submitter": "Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac@m.titech.ac.jp>",
  "eventId": "GRB 141220A"
}