GCN Circular 19080

T. Yoshii, Y.Saito, T.Fujiwara, Y. Tachibana,
Y.Ono, S.Harita, Y.Muraki, Y. Yatsu, and N. Kawai (Tokyo Tech)

report on behalf of the MITSuME collaboration:

We searched for the optical counterpart of GRB 160225A (M. H. Siegel et al., GCN 
Circular #19075) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm 
telescope of Akeno Observatory, Yamanashi, Japan.

The observation started on 2016-01-04 14:24:14 UT (198 sec after the burst) and 
we detected the optical counterpart in Rc and Ic band.
The measured magnitudes were listed as follows.

We obtained following limits for the magnitudes.

T0+[sec]    MID-UT      T-EXP[sec]         g'              Rc                      Ic
-------------------------------------------------------------------------------------------------------
378            14:27:14             270            > 19.4        18.2 +/- 0.1        17.1 +/- 0.2 
-------------------------------------------------------------------------------------------------------

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