{
  "bibcode": "2014GCN.16173....1F",
  "body": "T. Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi,\nS. Kurita, Y.Ono , Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 140423A (E. Sonbas et al., GCN Circular #16142) 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 2014-04-23 12:38:42 UT (4.1h after the burst).\nWe detected the previously reported optical afterglow of GRB140423A (D.Kuroda et al., GCN Circular #16160) in the Rc and Ic band.\n\nThe measured magnitudes were listed below.\n\nT0+[sec]     MID-UT       T-EXP[sec]              g'                         Rc                      Ic\n-------------------------------------------------------------------------------------------------------------------\n19710       14:00:28         7740            20.49+/-0.23      19.83+/-0.15    19.72+/-0.22\n31955       17:24:28         7560                    >21.3           20.35+/-0.19    19.89+/-0.23\n-------------------------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the burst \nT-EXP: Total Exposure time \nWe used GSC2.3 catalog for flux calibration.",
  "circularId": 16173,
  "createdOn": 1398436120000,
  "email": "yoshii.t.ac@m.titech.ac.jp",
  "subject": "GRB 140423A: MITSuME Akeno Optical observation",
  "submitter": "Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac@m.titech.ac.jp>",
  "eventId": "GRB 140423A"
}