{
  "bibcode": "2018GCN.22505....1S",
  "body": "K. Shiraishi, R. Itoh, K. L. Murata, T. Yoshii, Y. Tachibana, S. Harita, K.\nMorita, T. Ozawa, H. Mamiya, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe searched for the optical counterpart of GRB 180314A (P. D'Avanzo  et\nal., GCN Circular #22478) with the optical three color (g', Rc, and Ic) CCD\ncameras attached to the MITSuME 50 cm telescope of  Okayama Astrophysical\nObservatory, Japan.\n\nThe observation started on 10:32:06 UT. We did not find any new point\nsource within enhanced XRT circle (J.P. Osborne et al., GCN Circular\n#22480) in all three bands.\nWe obtained following limits for the magnitudes.\n\n\nT0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic\n------------------------------------------------------------\n-------------------------------------------\n9.99       12:03:20      7240     >19.3     >18.8     >18.6\n------------------------------------------------------------\n-------------------------------------------\n\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used GSC2.3 catalog for flux calibration.",
  "circularId": 22505,
  "createdOn": 1521199744000,
  "email": "murata@u.phys.nagoya-u.ac.jp",
  "subject": "GRB 180314A: MITSuME Okayama optical upper limits",
  "submitter": "Katsuhiro L. Murata at Nagoya U  <murata@u.phys.nagoya-u.ac.jp>",
  "eventId": "GRB 180314A"
}