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GCN Circular 14571

Subject
GRB 130505A: Xinglong TNT optical observations
Event
GRB 130505A
Date
2013-05-05T14:32:29Z (12 years ago)
From
L.P. Xin at NAOC <xlp@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 130505A  (Cannizzo, et al., GCN 14563)
using  80cm TNT telescope located at Xinglong observatory, China
at 12:25:39 UT on 2013-05-05.  We obtained several R-band images.  

The reported optical counterpart (Cannizzo, et al., GCN 14563) is detected in all images. 
A prelinary analysis shows that its brightness is decaying from R~18.05 to R~18.68 mag
during  4.05h and 4.85h after the trigger time. 
These magnitudes are calibrated with USNO B1.0 R2 stars, 

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