GCN Circular 29166
Subject
GRB 201223A: GWAC-F60A optical afterglow observations
Event
Date
2020-12-24T06:56:16Z (5 years ago)
From
Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>
L. P. Xin(NAOC), L. H. Li(NAOC), X. H. Han(NAOC), J. Y. Wei(NAOC), J. Wang(GXU),
C. Wu(NAOC), X. G. Wang(GXU), E. W. Liang (GXU), Y. L. Qiu(NAOC), and J. S. Deng(NAOC) report:
We began to observe GRB 201223A (Gropp et al., GCN #29158,
Wood et al., GCN #29161) with Xinglong GWAC-F60A telescope, China,
at 17:59:10.1 (UT), 23th. Dec. 2020, about 44 sec after the burst.
A series of R, I, and B band images were obtained.
The optical afterglow reported by (Lipunov et al., GCN #29157; Gropp et
al., GCN #29158; Zhu et al., GCN #29159; Hu et al.���GCN #29160;
Hosokawa et al., GCN #29164; Filipp Dmitrievich Romanov GCN #29165)
was clear detected in our images.
The brightness is fading from 15.0 mag to 18.8 mag in R band
during about 100 sec to 10000 sec after the burst.
The R-band brightness is calibrated to the USNO B1.0 catalog,
(RA=08:50:21.447, DEC=+71:12:12.80, J2000, R2=9.92)
More analysis are still continuing.
The message may be cited.