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GCN Circular 23372

Subject
GRB 181022A: MITSuME Akeno optical upper limits
Date
2018-10-23T15:22:37Z (6 years ago)
From
Yutaro Tachibana at Tokyo Tech <tachibana@hp.phys.titech.ac.jp>
K. Iida, Y. Tachibana, R. Itoh, K. L. Murata, S. Harita, K. Morita,
K. Shiraishi, M. Niwano, R. Adachi, M. Oeda,
Y. Yatsu, and N. Kawai (Tokyo Tech)
report on behalf of the MITSuME collaboration:

We searched for the optical counterpart of GRB 181022A
(F. E. Marshall et al., GCN Circular #23364)
with the optical three color (g', Rc, and Ic) CCD cameras attached to
the MITSuME 50cm telescope of Akeno Observatory, Yamanashi, Japan.

The observation started on 2018-09-05 17:32:02.95 UT.
We did not find any point source at the enhanced position of the
XRT error circle (F. E. Marshall et al., GCN Circular #23364) in all three
bands.
We obtained following 3-sigma upper limits for the magnitudes.

T0+[min]    MID-UT      T-EXP[sec]    g'       Rc        Ic
-------------------------------------------------------------------------------------------------------
109.95     18:29:22  420   >18.4   >18.2   >17.7
-------------------------------------------------------------------------------------------------------

T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC catalog for flux calibration.
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