GCN Circular 14280

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 130306A (Siegel et al., GCNC 14266)
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 2013-03-07 19:28:07 UT (~19.6 h after the burst).
We did not find any new point source within the refined BAT error circle
(Barthelmy et al., GCNC 14279) in all the three bands.

Three sigma upper limits of the OT are listed below. We used
GSC2.3(for g' and Rc) and USNO-B1(for Ic) catalog for flux calibration.

T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
------------------------------------------------------
0.84918    20:13:51    4560.0   >20.6  >19.5  >18.4
------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]