[vsnet-grb-info 14846] GRB 140423A: MITSuME Okayama Optical Observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  16160
SUBJECT: GRB 140423A: MITSuME Okayama Optical Observation
DATE:    14/04/24 04:30:15 GMT
FROM:    Daisuke Kuroda at OAO/NAOJ  <dikuroda at oao.nao.ac.jp>

D. Kuroda, K. Yanagisawa, Y. Shimizu, H. Toda (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 140423A (Sonbas et al., GCNC 16142)
with the optical three color (g', Rc and Ic) CCD camera attached
to the MITSuME 50cm telescope of Okayama Astrophysical Observatory.

The observation started on 2014-04-23 10:43:36 UT (~2.2 h after the burst).
We detected the previously reported afterglow (Elenin et al., GCNC 16143;
Kaur et al., GCNC 16144; Ferrante et al., GCNC 16145) in all the three bands.

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
-----------------------------------------------------------------------
0.21728    13:44:45    5880.0     20.1 0.3    20.1 0.2     19.5 0.3
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]