TITLE: GCN CIRCULAR NUMBER: 15379 SUBJECT: GRB 131024B : Xinglong TNT upper limit DATE: 13/10/25 13:48:56 GMT FROM: L.P. Xin at NAOC L. P. Xin, 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 131024B (Krimm et al., GCN 15371) with Xinglong 0.8-m TNT telescope at 21:38:56 (UT), about 3.4 min after the burst. 3*300 sec R-band images were obtained. No any optical counterpart within the XRT error circle was detected down to a limit of 18.4 mag in R band, calibrated by USNO B1.0 R2mag at the mean time of 11.25 min after the burst. This message may be cited.