[vsnet-grb-info 21606] GRB 190114B: MITSuME Akeno optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  23705
SUBJECT: GRB 190114B: MITSuME Akeno optical upper limits
DATE:    19/01/15 05:48:16 GMT
FROM:    Ryosuke Itoh at Tokyo Institute of Tech.  <itoh at hp.phys.titech.ac.jp>

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.