GCN Circular 19599

D. Kuroda (OAO, NAOJ),  H. Hanayama, T. Miyaji, J. Watanabe (IAO, NAOJ),
K. Yanagisawa (OAO, NAOJ), S.Nagayama (NAOJ), M. Yoshida (Hiroshima),
K. Ohta (Kyoto) and N. Kawai(Tokyo Tech)
report on behalf of the MITSuME and OISTER collaboration:

We observed the field of GRB 160625B (Dirirsa et al., GCNC 19580;
Melandri et al., GCNC 19585) with the optical three color (g', Rc
and Ic) CCD camera attached to the Murikabushi 1m telescope of
Ishigakijima Astronomical Observatory.

The observation started on 2016-06-26 14:03:44 UT (~15.3 h after
the burst). We detected the previously reported afterglow
(Troja et al., GCNC 19588) in in all the three bands.

The photometric results of the OT are listed below.
We used GSC2.3 catalog for flux calibration.

#T0+[day]  MID-UT    T-EXP[sec] g'    g'_e  Rc    Rc_e  Ic    Ic_e
-------------------------------------------------------------------
0.64273    14:08:57     540.0   19.16 0.10  18.59 0.05  18.08 0.10
0.73075    16:15:41     540.0   19.27 0.08  18.78 0.06  18.28 0.08
-------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]