[vsnet-grb-info 13718] GRB 130725A: MITSuME Ishigakijima Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15033
SUBJECT: GRB 130725A: MITSuME Ishigakijima Optical Observation
DATE:    13/07/26 01:04:02 GMT
FROM:    Daisuke Kuroda at OAO/NAOJ  <dikuroda at oao.nao.ac.jp>

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 collaboration:

We observed the field of GRB 130725A (Zhang et al., GCNC 15028)
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 2013-07-25 13:34:52 UT (~2.0 h after the
burst). We detected the afterglow candidate within the XRT error circle
(Zhang et al., GCNC 15028) in only Rc band.

Photometric result and three sigma upper limits of the OT are listed below.
We used SDSS catalog for flux calibration.

#T0+[day]  MID-UT    T-EXP[sec]   g'     Rc  Rc_err  Ic
----------------------------------------------------------------------
0.10534    14:08:53   2280.0    >21.3   20.8 0.2   >19.8
----------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]