[vsnet-grb-info 18498] GRB 160925A: MITSuME Akeno Optical Observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19946
SUBJECT: GRB 160925A: MITSuME Akeno Optical Observations
DATE:    16/09/27 10:33:25 GMT
FROM:    Taketoshi Yoshii at Tokyo Tech  <yoshii.t.ac at m.titech.ac.jp>

T.Fujiwara, T. Yoshii, Y.Saito, R.Itoh, Y. Tachibana,
Y.Ono, S.Harita, T.Ozawa, K.Saisho, Y. Yatsu, and N. Kawai (Tokyo Tech)

report on behalf of the MITSuME collaboration:

We observed the field of GRB 160925A (C. Guidorzi et al., GCN
Circular #19939) 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 2016-09-26 12:21:13 UT (~0.75 day after the burst) and
we detected the optical counterpart in Rc and Ic band.
The measured magnitudes were listed as follows.

We obtained following results for the magnitudes.

T0+[day]    MID-UT      T-EXP[sec]         g'              Rc                      Ic
-------------------------------------------------------------------------------------------------------
 0.75           12:53:24          480         15.96 +/- 0.04      16.00 +/- 0.05      15.93 +/- 0.06
-------------------------------------------------------------------------------------------------------

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