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GCN Circular 29235

Subject
GRB 210104A: GWAC-F60A optical afterglow observations
Date
2021-01-04T12:00:26Z (3 years ago)
From
Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>
L. P. Xin(NAOC),  J. Wang(GXU), X. H. Han(NAOC), J. Y. Wei(NAOC), 
G. W. LI(NAOC),  L. H. Li(NAOC), C. Wu(NAOC),  X. G. Wang(GXU), 
E. W. Liang (GXU), R. S. Zhang(NAOC), Y. L. Qiu(NAOC), 
and J. S. Deng(NAOC) report: 

We began to observe GRB 210104A (Troja et al., GCN 29233)
with Xinglong GWAC-F60A telescope, China, 
at 11:28:00 (UT), 4th. Jan. 2021, about 61 sec after the burst.

A series of  R, I, and B band images were obtained.
The optical afterglow (Troja et al., GCN 29233) 
was clear detected in our images. 

The brightness is about 14.5 mag in R band at 71 sec after the burst,
calibrated to the USNO B1.0 catalog.

The observations are continuing
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