GCN Circular 13846

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 collaboration:

We observed the field of GRB 121011A (Racusin et al., GCNC 13845)
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 2012-10-11 11:17:00 UT, (~90 sec after the burst)
We detected the previously reported afterglow (Racusin et al., GCNC 13845)
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
-----------------------------------------------------------------------
0.00449    11:21:58    540.0     17.23 0.09   16.81 0.05   16.11 0.05
0.01159    11:32:11    540.0     17.36 0.10   16.65 0.04   16.10 0.04
------------------------------------------------------------------------
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]