TITLE:   GCN CIRCULAR
NUMBER:  23703
SUBJECT: GRB 190114B: GWAC-F60B upper limit
DATE:    19/01/15 03:15:45 GMT
FROM:    L.P. Xin at NAOC  <xlp@nao.cas.cn>

L. P. Xin,  Y. J. Xiao, P. P. Zhang, R. S. Zhang,  J. Wang,   J. Y. Wei,   
E. W. Liang,  X. G. Wang,    Y. G. Yang,  X. M. Lu,  L. Huang,    H. B. Cai,   
Y. L. Qiu,  Y. Xu, Y.  J. Xiao, Y. T. Zheng,  C. Wu,   J. S. Deng,  D. W. Xu, 
D. TURPIN, H. L. Li, and W. L. Dong, report:

We  started to observe  GRB 190114B  ( Siegel et al., GCN 23686 )  
with  GWAC-F60B 60cm optical telescope  at 19:46:26 UT, 
Jan. 14th  2019,  about 14  min after the burst. 

The afterglow reported by ( Goad et al., GCN 23691;  Fernandez-Garcia et al., GCN 23694; 
Pozanenko et al., GCN 23696) was not detected  in R band images.  
The upper limit is estimated to be about 18.3 mag  calibrated by nearby USNO-B1.0 stars.

GWAC-F60B is operated by Guangxi university and NAOC, CAS, at Xinglong observatory, China.

The message may be cited.