{
  "bibcode": "2015GCN.17715....1F",
  "body": "T.Fujiwara, Y. Saito, T. Yoshii, Y. Tachibana, H. Ohuchi, \nY. Yano, S.Kurita, Y. Ono, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 150413A (C. B. Markwardt et al. GCN Circular #17688) with \nthe optical 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 2015-04-13 15:58:02 UT (~2.1 h after the burst).\nWe detected the previously reported optical afterglow (K.Ivanov et al. GCN Circular #17689) in the Ic band.\n\nThe measured magnitudes are listed below.\n\nT0+  MID-UT  T-EXP[sec]    g'                Rc             Ic\n----------------------------------------------------------------------\n263 min   4/13 18:17:28  240     > 17.3  > 17.2  16.09 +/- 0.30\n2.04 days   4/15 14:52:50  15960    > 21.7  > 21.5  > 20.2\n----------------------------------------------------------------------\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used GSC2.3 catalog for flux calibration.",
  "circularId": 17715,
  "createdOn": 1429276623000,
  "email": "yoshii.t.ac@m.titech.ac.jp",
  "subject": "GRB 150413A: MITSuME Akeno Optical observation",
  "submitter": "Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac@m.titech.ac.jp>",
  "eventId": "GRB 150413A"
}