{
  "bibcode": "2013GCN.14755....1I",
  "body": "K. Ito, Y. Saito, Y. Yano, R. Usui, Y. Tachibana, T. Yoshii,\nS. Kurita, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe observed the field of GRB 130603A (Melandri et al., GCNC 14731) 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 2013-06-03 10:10:04 UT ( ~4.2 h after\nthe burst). And we could not find any new point source within the XRT\nerror circle (Beardmore et al., GCNC 14737) in all the three bands.\n\nThe results of photometry (3 sigma upper limits) are listed below.\nWe used GSC2.3 catalog for flux calibration.\n\n\nT0+[hour]     MID-UT   T-EXP[sec]             g'             Rc                Ic\n--------------------------------------------------------------------------------------------\n       4.175   12:30:14              9054      >19.4        >19.4        >18.7\n--------------------------------------------------------------------------------------------\nT0+ : Elapsed time after the burst [hour]\nT-EXP: Total Exposure time [sec]",
  "circularId": 14755,
  "createdOn": 1370337456000,
  "email": "yoshii.t.ac@m.titech.ac.jp",
  "subject": "GRB 130603A: MITSuME Akeno Optical observation",
  "submitter": "Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac@m.titech.ac.jp>",
  "eventId": "GRB 130603A"
}