[vsnet-grb-info 21869] GRB190311A: MITSuME Akeno optical observation
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Fri Mar 15 21:12:21 JST 2019
TITLE: GCN CIRCULAR
NUMBER: 23968
SUBJECT: GRB190311A: MITSuME Akeno optical observation
DATE: 19/03/15 12:11:13 GMT
FROM: Kota Iida at Tokyo Inst. of Tech. <kota0722iida at gmail.com>
K. Iida, R. Itoh, K. L. Murata, Y. Tachibana, S. Harita, K. Morita,
K. Shiraishi, M. Oeda, M. Niwano, R. Adachi, Y. Yatsu,
and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration
We searched for the optical counterpart of GRB 190311A (Troja et
al., GCN
Circular #23946) 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 14:24:43.64 UT which corresponds to
70 sec after the trigger.
We detected the point source at the position consistent with the
afterglow detected previously (Troja et al. GCN #23946; Pozanenko et
al. GCN #23947; Zhu et al. GCN #23948; Gorbovskoy et al. GCN #23949,
Belkin et al. GCN #23951).
The measured magnitudes are listed as follows.
T0+[sec] MID-UT T-EXP[sec] g' Rc Ic
-------------------------------------------------------------------------------------------------------
~70 14:24:46.22 540 18.9+/-0.2
18.6+/-0.2 18.2+/-0.2
-------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used GSC2.3 catalog for flux calibration.
The magnitudes are expressed in the Vega system.
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