Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 13575

GRB 120803B: MITSuME Okayama Optical upper limits
2012-08-04T05:31:28Z (12 years ago)
Daisuke Kuroda at OAO/NAOJ <>
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 120803B (Racusin et al., GCNC 13566)
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 2012-08-03 11:46:48 UT (~41 min after the burst)
We did not find any new point source within the XRT circle
(Goad et al., GCNC 13571) in all the three bands.
We also could not detect the previously reported afterglow (Guidorzi et al.,
GCNC 13567).

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

T0+[day]   MID-UT   T-EXP[sec]    g'     Rc     Ic
0.06994    12:46:50    6360.0   >20.5  >20.2  >18.9
T0+ : Elapsed time after the burst [day]
T-EXP: Total Exposure time [sec]
Looking for U.S. government information and services? Visit