{
  "bibcode": "2014GCN.16176....1O",
  "body": "Y. Ono, Y. Tachibana, Y. Saito, H. Ohuchi, T. Yoshii, \nS. Kurita, T. Fujiwara, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe performed the follow-up observation for optical afterglow of GRB140423A(E.Sonbas et al., GCN Circular #16142, Elenin et al.,GCN Circular #16143 etc.) with the optical three color (g, Rc, and Ic) CCD cameras attached to the MITSuME 50 cm\ntelescope of Akeno Observatory, Yamanashi, Japan.\nThe observation started on 2014-04-24 14:10:46 UT (31.1h after the burst).\nWe did not find the optical source on the position of GRB140423A.\n\nThe measured magnitudes were listed below.\n\nT0+[sec]           MID-UT             T-EXP[sec]         g'     Rc       Ic\n-------------------------------------------------------------------------\n44700      14-04-24 15:42:02      9600          >21.3  >21.2  >20.6\n-------------------------------------------------------------------------\nT0+ : Elapsed time after the burst \nT-EXP: Total Exposure time \nWe used GSC2.3 catalog for flux calibration.",
  "circularId": 16176,
  "createdOn": 1398686633000,
  "email": "yoshii.t.ac@m.titech.ac.jp",
  "subject": "GRB 140423A: MITSuME Akeno upper limits",
  "submitter": "Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac@m.titech.ac.jp>",
  "eventId": "GRB 140423A"
}