{
  "bibcode": "2018GCN.23408....1M",
  "body": "K. L. Murata, R. Itoh, Y. Tachibana, S. Harita, K. Morita, K. Shiraishi, K.\nIida, M. Oeda, M. Niwano, R. Adachi, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe searched for the optical counterpart of GRB 181103A (A. Tohuvavohu  et\nal., GCN Circular #23402) 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 19:38:58 UT. We did not find any new point\nsource within enhanced XRT circle (P.A. Evans et al., GCN Circular #23403)\nin all three bands. We obtained following limits for the magnitudes.\n\nT0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic\n-------------------------------------------------------------------------------------------------------\n15.352       20:15:29          3240      >18.5     >18.0     >17.5\n-------------------------------------------------------------------------------------------------------\n\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used GSC2.3 catalog for flux calibration.",
  "circularId": 23408,
  "createdOn": 1541392548000,
  "email": "murata@u.phys.nagoya-u.ac.jp",
  "subject": "GRB 181103A: MITSuME Okayama optical upper limits",
  "submitter": "Katsuhiro L. Murata at Nagoya U  <murata@u.phys.nagoya-u.ac.jp>",
  "eventId": "GRB 181103A"
}