GCN Circular 26776
Subject
GRB 200115A: MITSuME Okayama optical upper limits
Date
2020-01-15T15:01:10Z (5 years ago)
From
Masafumi Niwano at Tokyo Institute of Tech <niwano@hp.phys.titech.ac.jp>
M. Niwano, K. L. Murata, M. Oeda, K. Shiraishi, K. Iida, R. Adachi, F.
Ogawa, S. Toma, R. Hosokawa, N. Nakamura, Y. Yatsu, and N.
Kawai(TokyoTech) report on behalf of the MITSuME collaboration:
We searched for the optical counterpart of GRB 200115A (S. B. Cenko et
al.,GCN Circular #26771) with the optical three color (g', Rc, and Ic)
CCD cameras attached to the MITSuME 50 cm telescope of Okayama
Astrophysical Observatory, Okayama, Japan.
The observation started on 11:52:38.68 UT. We did not find any new point
sources within the Swift/BAT circle (S. B. Cenko et al., GCN Circular
#26771) in all three bands.
We obtained the 5-sigma limits as follows.
T0+[sec]���� MID-UT������ T-EXP[sec]������ 5-sigma limits
------------------------------------------------------------------------------------------------
135���� 12:23:04.98���� 3060���� g'>18.3, Rc>17.6, Ic>17.2
------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the burst
T-EXP: Total Exposure time
We used UCAC4 catalog for flux calibration.
The magnitudes are expressed in the AB system.
The images were processed in real-time through the MITSuME GPU reduction
pipeline (Niwano et al. ,in prep; https://github.com/MNiwano/Eclair)