[vsnet-grb-info 13161] GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14498
SUBJECT: GRB 130427A: MITSuME Okayama and Ishigakijima Optical Observation after 1 day
DATE:    13/04/29 06:06:15 GMT
FROM:    Daisuke Kuroda at OAO/NAOJ  <dikuroda at oao.nao.ac.jp>

D. Kuroda, (OAO, NAOJ), H. Hanayama (IAO, NAOJ), K. Yanagisawa,
Y. Shimizu, H. Toda (OAO, NAOJ), T. Miyaji J. Watanabe, (IAO, 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 MITSuME 50cm telescope of Okayama Astrophysical Observatory
and the Murikabushi 1m telescope of Ishigakijima Astronomical
Observatory.

We detected the previously reported afterglow (Elenin et al., GCNC 14450)
in all the three bands. Photometric results of the OT are listed below.
We used SDSS catalog for flux calibration.

Okayama Astrophysical Observatory:
The observation started on 2013-04-28 11:29:25 UT (~1.15 days after the burst).

#T0+[day]  MID-UT    T-EXP[sec]   g'   g'_err Rc    Rc_err Ic    Ic_err
-----------------------------------------------------------------------
1.16123    11:40:06    1440.0    18.4   0.2   17.9   0.1   17.7   0.1
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]

Ishigakijima Astronomical Observatory:
The observation started on 2013-04-28 14:02:08 UT (~1.26 days after the burst).
#T0+[day]  MID-UT    T-EXP[sec]   g'   g'_err  Rc   Rc_err  Ic   Ic_err
-----------------------------------------------------------------------
1.31290    15:18:30    1020.0    18.61 0.06   18.22 0.04   17.37 0.05
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]