[vsnet-grb-info 14464] GRB 140102A: MITSuME Akeno Optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15778
SUBJECT: GRB 140102A: MITSuME Akeno Optical observation  
DATE:    14/01/30 14:06:05 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

T. Yoshii, Y. Saito, S. Kurita, Y. Tachibana, K. Ito, R. Usui, T.Tanigawa, Y. Yano,Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We observed the field of GRB 140102A (L. M. Z. Hagen et al., GCN Circular #15653) 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 2014-01-02 21:18:44 UT ( 67sec after the burst).
We detected the previously reported optical afterglow of GRB140102A (D. Xu et al., GCN Circular #15655) in the Ic band.

The measured magnitudes were listed below.

T0+      MID-UT      T-EXP        mag
----------------------------------------------------
67[sec]  21:18:59    30[sec]              Rc = 14.36 $B!^(B 0.4    Ic = 13.01+/-0.17
----------------------------------------------------
T0+ : Elapsed time after the burst [sec]
T-EXP: Total Exposure time [sec]
We used GSC2.3 catalog for flux calibration.