[vsnet-grb-info 13155] GRB 130427A : Xinglong TNT optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14492
SUBJECT: GRB 130427A : Xinglong TNT optical observation
DATE:    13/04/28 17:55:49 GMT
FROM:    L.P. Xin at NAOC  <xlp at bao.ac.cn>

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

We began to observe the field of GRB 130427A  (Maselli, et al., GCN 14448)
using  80cm TNT telescope located at Xinglong observatory, China
at 12:52:38 UT on 2013-04-28.  We obtained several B, V, R-band images.  

The optical counterpart is detected in all images. The prelinary analysis shows that
its brightness is about R=18.3 mag, calibrated with USNO B2 stars, 
at the mean time of  29.08 h after the trigger time.

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