GCN Circular 16794

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]