[vsnet-grb-info 15505] GRB 140907A: MITSuME Ishigakijima Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16794
SUBJECT: GRB 140907A: MITSuME Ishigakijima Optical Observation
DATE:    14/09/08 00:47:24 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 and OISTER collaboration:

We observed the field of GRB 140907A (Krimm et al., GCNC 16788)
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 2014-09-07 16:18:10 UT (~11 min after the burst).
We detected the previously reported afterglow (Xu et al., GCNC 16789;
Kuin and Krimm, GCNC 16791) in all the three bands.

Photometric results of the OT are listed below.
We used GSC 2.3 catalog for flux calibration.

#T0+[day]  MID-UT    T-EXP[sec]  g'    g'_err  Rc    Rc_err  Ic    Ic_err
--------------------------------------------------------------------------
0.01128    16:23:22     540.0    17.97 0.05    17.07 0.03    16.44 0.03
0.14407    19:34:36     540.0    19.73 0.12    19.36 0.11    18.48 0.11
--------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]