GCN Circular 23211
Subject
GRB 180905A: MITSuME Akeno optical upper limits
Date
2018-09-06T05:53:52Z (6 years ago)
From
Katsuhiro L. Murata at Nagoya U <murata@u.phys.nagoya-u.ac.jp>
M. Niwano, R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita,
K. Shiraishi, K. Iida, 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 180905A
(V. D'Elia et al., GCN Circular #23201)
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 17:29:51.08 UT.
We did not find any point source at the enhanced position of the
XRT error circle (A.P. Beardmore et al., GCN Circular #23207) in all three
bands.
We obtained following 5-sigma upper limits for the magnitudes.
T0+[min] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
202.32 18:46:39 8,100 >18.9 >18.6 >18.4
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC-4 catalog for flux calibration.