TITLE:   GCN CIRCULAR
NUMBER:  23532
SUBJECT: GRB 181213A: GWAC-F60A upper limit 
DATE:    18/12/14 01:48:15 GMT
FROM:    L.P. Xin at NAOC  <xlp@nao.cas.cn>

X. H. Han, R. S. Zhang,  L. P. Xin,  J. Wang,  P. P. Zhang, J. Y. Wei,   E. W. Liang, 
X. G. Wang, Y. J. Xiao,   Y. G. Yang,  X. M. Lu,  L. Huang,    H. B. Cai,   
X. M. Meng,   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  observed  GRB 181213A  ( Evans et al., GCN 23525; Osborne 
et al., GCN 23528 )  with  GWAC-F60A 60cm optical telescope 
at 21:21:34 UT, Dec. 13th 2018,  about 8.4  hours after the burst. 
The exposure time is 150 sec in R band. the airmass is 1.56. 

The optical afterglow reported by (Lipunov et al., GCN 23526; Hu et al. GCN 23527; 
 Siegel  et al., GCN 23529; Belkin et al., GCN 23530) is not detected with an upper 
limit of 18.2 mag in R band image. The brightness is calibrated by nearby USNO-B1.0 stars.

GWAC-F60A is operated by Guangxi university and NAOC, CAS, 
at Xinglong observatory, China.

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