[vsnet-grb-info 17644] GRB 160225A: MITSuME Okayama Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19081
SUBJECT: GRB 160225A: MITSuME Okayama Optical Observation
DATE:    16/02/25 23:50:50 GMT
FROM:    Daisuke Kuroda at OAO/NAOJ  <dikuroda at oao.nao.ac.jp>

D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (OAO, NAOJ),
S. Nagayama (NAOJ), M. Yoshida (Hiroshima), K. Ohta (Kyoto)
and N. Kawai(Tokyo Tech)
report on behalf of MITSuME and OISTER collaboration:

We observed the field of GRB 160225A (Siegel et al., GCNC 19075)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.

The observation started on 2016-02-25 14:26:51 UT (~5.9 min after
the burst). We detected the previously reported afterglow (Yoshii
et al., GCNC 19080) in Rc and Ic bands.

Photometric results and three sigma upper limit of the OT are
listed below. We used SDSS-DR7 catalog for flux calibration.

#T0+[day]  MID-UT    T-EXP[sec]   g'    Rc  Rc_err  Ic  Ic_err
------------------------------------------------------------------
0.00777    14:32:08     540.0   >19.4   18.6 0.2    17.8 0.2
------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]