GCN Circular 16320
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. The message may be cited.