{
  "bibcode": "2018GCN.22623....1I",
  "body": "R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita, T. Ozawa, H. Mamiya,\nK. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)\nreport on behalf of the MITSuME collaboration:\n\nWe searched for the optical counterpart of GRB 180410A (J. D. Gropp et\nal., GCN Circular #22620)\nwith the optical three color (g', Rc, and Ic) CCD cameras attached to\nthe MITSuME 50cm telescope\nof Akeno Observatory, Yamanashi, Japan.\nThe observation started on 2018-04-10 10:02:24 UT.\nWe did not find any point source at the position of the XRT error\ncircle (P. A. Evans et al., GCN Circular #22622)\nin all three bands. We obtained following limits for the magnitudes.\n\nT0+[hour]    MID-UT      T-EXP[sec]    g'       Rc        Ic\n-------------------------------------------------------------------------------------------------------\n~2.0           10:27:25       2,700         >18.8   >18.7   >18.0\n-------------------------------------------------------------------------------------------------------\n\nT0+ : Elapsed time after the burst\nT-EXP: Total Exposure time\nWe used UCAC-4 catalog for flux calibration.",
  "circularId": 22623,
  "createdOn": 1523363470000,
  "email": "itoh@hp.phys.titech.ac.jp",
  "subject": "GRB 180410A: MITSuME Akeno optical upper limits",
  "submitter": "Ryosuke Itoh at Tokyo Institute of Tech.  <itoh@hp.phys.titech.ac.jp>",
  "eventId": "GRB 180410A"
}