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GCN Circular 16320

Subject
GRB 140521A : Xinglong TNT upper limit
Date
2014-05-23T07:50:38Z (10 years ago)
From
L.P. Xin at NAOC <xlp@bao.ac.cn>
L. P. Xin,   X. F. Wang,  J. Y. Wei,  Y. L. Qiu, J. S. Deng,  
J. Wang, X. H. Han and C. Wu on behalf of EAFON report:

We began to observe GRB 140521A (Troja et al., GCN 16311)  
with Xinglong  0.8-m TNT telescope at 15:35:50 (UT) , 
92 sec after the burst.

No any optical transient was detected in our single or stacked image.
The 3-sigma upper limit magnitude is about 18.4 mag at the mean time of
7.3 min , calibrated by nearby USNO B1.0 R2 mag.

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