GCN Circular 6956
L.P. Xin, M. Zhai, Y.L. Qiu, J.Y. Wei, J.Y. Hu, J.S. Deng, J. Wang, Y. Urata and W.K. Zheng on behalf of EAFON report: We have imaged the field of GRB071020A (Barthelymy et al GCN6949) using the TNT 0.8 telescope at Xinglong observatory. A series of R-band images were obtained from 17:08:19.4, 10.1 hours after the burst. In our 15*600s combined image, �we detected afterglow (Schaefer et al GCN6947, Beardmore et al GCN 6955), The estimated brightness derived from USNO-B1.0 was R=21.14 +/- 0.08 at 11.5 hours after the burst (mean time of the stacked image). Further observations are encouraging. This message may be cited.