[vsnet-grb-info 13832] GRB 130831A : Xinglong 60cm optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15146
SUBJECT: GRB 130831A : Xinglong 60cm optical observation
DATE:    13/08/31 19:39:25 GMT
FROM:    L.P. Xin at NAOC  <xlp at bao.ac.cn>

L. P. Xin,   X. H. Han, Y. L. Qiu,  J. Y. Wei,  J. Wang,  
J. S. Deng and C. Wu on behalf of EAFON report:

We began to observe GRB 130831A (Hagen et al. GCN 15139)  
with Xinglong 60cm telescope at  15:42:00 (UT), 
about 2.7 hours after the burst.  
A series of white and R-band images were obtained. 

The OT reported by (Hagen et al. GCN 15139, Guidorzi et al. GCN 15140, 
Xu et al. GCN 15142;  Yoshii et al. GCN 15143, Cucchiara  et al. GCN 15144) 
was detected in all images.  The brightness of this OT was about R=16.6 mag 
at  2.7 hours  after the burst,  calibrated by USNO B1.0 R2 mag.

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