[vsnet-grb-info 14075] Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15389
SUBJECT: Swift Trigger 575905/ GRB 131026A: MITSuME Okayama and Ishigakijima Optical upper limits
DATE:    13/10/27 11:07:44 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 1301026A (Swift Trigger 575905) (Cenko et al., GCNC
15384) 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 did not find any new point source within the BAT error circle (Cenko et al.,
GCNC 15384) in all the three bands.

Three sigma upper limits of the OT are listed below. We used GSC2.3 catalog for
flux calibration.

Okayama Astrophysical Observatory:
The observation started on 2013-10-26 10:01:09 UT (~3.4 h after the burst).
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.24326    12:29:49    6300.0    >19.7  >19.6  >18.6
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]


Ishigakijima Astronomical Observatory:
The observation started on 2013-10-26 13:13:44 UT (~6.6 h after the burst).
T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.30110    13:53:07    3360.0    >21.6  >21.0  >20.4
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]