{
  "bibcode": "2018GCN.22518....1M",
  "body": "K. L. Murata, R. Itoh, T. Yoshii, Y. Tachibana, S. Harita, K. Morita, T.\nOzawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe searched for the optical counterpart of GRB 180316A (A. Melandri  et\nal., GCN Circular #22500) with the optical three color (g', Rc, and Ic) CCD\ncameras attached to the MITSuME 50 cm telescope of Akeno Observatory,\nYamanashi, Japan.\n\nThe observation started on 16:39:08 UT. We did not find any new point\nsource within enhanced XRT circle (P.A. Evans et al., GCN Circular #22508)\nin all three bands.\nWe obtained following limits for the magnitudes.\n\n\nT0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic\n------------------------------------------------------------\n-------------------------------------------\n11.71       18:28:36      11620     >20.6     >19.7     >18.9\n------------------------------------------------------------\n-------------------------------------------\n\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used GSC2.3 catalog for flux calibration.",
  "circularId": 22518,
  "createdOn": 1521444417000,
  "email": "murata@u.phys.nagoya-u.ac.jp",
  "subject": "GRB 180316A: MITSuME Akeno optical upper limits",
  "submitter": "Katsuhiro L. Murata at Nagoya U  <murata@u.phys.nagoya-u.ac.jp>",
  "eventId": "GRB 180316A"
}