[vsnet-grb-info 13176] GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14513
SUBJECT: GRB 130427A: MITSuME Ishigakijima Optical Observation after 2 days
DATE:    13/04/30 14:33:12 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 130427A (Masell et al., GCNC 14448)
with the optical three color (g', Rc and Ic) CCD camera attached
to the Murikabushi 1m telescope of Ishigakijima Astronomical
Observatory.

We detected the previously reported afterglow (Elenin et al., GCNC 14450)
in all the three bands. The observation started on 2013-04-29 15:02:55 UT (~2.30
days after the burst).

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

#T0+[day]  MID-UT    T-EXP[sec]   g'   g'_err  Rc   Rc_err  Ic   Ic_err
-----------------------------------------------------------------------
2.31262    15:18:06   1500.0     19.19 0.05   18.87 0.04   18.65 0.09
2.33383    15:48:38   1440.0     19.29 0.06   18.90 0.05   18.76 0.11
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]