TITLE: GCN CIRCULAR NUMBER: 14415 SUBJECT: GRB130420A : Xinglong TNT optical upper limit DATE: 13/04/20 15:59:58 GMT FROM: L.P. Xin at NAOC L.P. Xin, M. Zhai, 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 130420A (Page et al., GCN 14406 ) using 80cm TNT telescope located at Xinglong observatory, China at 12:16:56 UT on 2013-04-20. We obtained 12x300s R-band images in a poor seeing and cloudy weather, with a median time of 5.3 hr after the BAT trigger. The afterglow reported (Page et a., GCN 14406 ) is not detected in the stacked image, down to a 3 sigma limit of R~18.0 mag, calibrated with USNO B2 stars. This message may be cited.