{
  "bibcode": "2015GCN.17841....1H",
  "body": "S.Harita, T.Fujiwara, T. Yoshii, Y. Saito, Y. Tachibana, H. Ohuchi, Y. Yano,\nS. Kurita, Y.Ono, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the XRT-UVOT enhanced position of GRB150518A (T.Kawamuro et al., GCN Circular #17825) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope of Akeno Observatory, Yamanashi, Japan.\n\nThe observation started on 2015-05-19 11:08:33 UT (~13.5 h after the burst).\nWe detected the previously reported optical afterglow of GRB150518A (B.Sbarufatti et al., GCN Circular #17827) in the Rc and Ic band.\nAlthough estimated magnitude of Ic band has large error, we could find a faint point source.\n\nWe obtained following limits for the magnitudes.\n\nT0+[sec]      MID-UT      T-EXP[sec]         g'           Rc           Ic\n------------------------------------------------------------------------------------------------\n  48379     13:43:24          4380           >20.7      20.4+/-0.3     19.7+/-0.43\n------------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used GSC2.3 catalog for flux calibration",
  "circularId": 17841,
  "createdOn": 1432229761000,
  "email": "yoshii.t.ac@m.titech.ac.jp",
  "subject": "GRB 150518A: MITSuME Akeno Optical observation",
  "submitter": "Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac@m.titech.ac.jp>",
  "eventId": "GRB 150518A"
}