GCN Circular 22399

K. Morita, R. Itoh, K. L. Murata, T. Yoshii, Y. Tachibana, S. Harita, T.
Ozawa, H. Mamiya, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We searched for the optical counterpart of GRB 180204A (K. L. Page et al.,
GCN Circular #22375) with the optical three color (g', Rc, and Ic) CCD
cameras attached to the MITSuME 50 cm telescope of Okayama Astrophysical
Observatory, Japan.
The observation started on 2018-02-04 9:37:11.83 UT. We did not find any
new point source within the XRT circle (J. P. Osborne et al., GCN Circular
#22377) in all three bands.
We obtained following limits for the magnitudes.

T0+[h]    MID-UT      T-EXP[sec]    g'        Rc        Ic
------------------------------------------------------------
-------------------------------------------
~7.0         9:48:54         1140       >17.5     >17.4      >17.0
------------------------------------------------------------
-------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration