GCN Circular 22754
Subject
GRB 180602A: MITSuME Okayama optical upper limits
Date
2018-06-02T12:30:27Z (6 years ago)
From
Yutaro Tachibana at Tokyo Tech <tachibana@hp.phys.titech.ac.jp>
Y. Tachibana, R. Itoh, K. L. Murata, S. Harita, K. Morita,
T. Ozawa, H. Mamita, K. Shiraishi, Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:
We observed the field of GRB 180602A (Cenko et al., GCN Circular #22752)
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 2018-06-02 11:14:03.47 UT (~3 hours after
the burst). We did not find any new point source within the
enhanced XRT error circle (Osborne et al., GCN Circular #22753) in all
the three bands.
We obtained following limits for the magnitudes.
T0+[hour] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
~3.07 ~11:18:47 420 >17.8 >17.7 >17.1
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.