GCN Circular 23705

R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita,
K. Shiraishi, K. Iida, M. Niwano, R. Adachi, M. Oeda,  Y. Yatsu,
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration

We searched for the optical counterpart of
GRB 190114B (M. Siegel et al., GCN #23686)
with the optical three color (g', Rc, and Ic)
CCD cameras attached to the MITSuME 50 cm telescope at Akeno
Observatory,Yamanashi, Japan.

The observation started on 19:33:01 UT which corresponds to 109 sec
after the trigger.
We did not find any new point source within the enhanced XRT circle
(Goad et al., GCN #23691;  Fernandez-Garcia et al., GCN #23694;
Pozanenko et al., GCN #23696; Xin et al., GCN #23703) in all three bands.
We obtained following 5 sigma limits for the magnitudes.

T0+[sec]    MID-UT      T-EXP[sec]    g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
109  19:37:35    480    >19.4     >18.7     >18.2
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.