TITLE: GCN CIRCULAR NUMBER: 17638 SUBJECT: GRB 150323B : Xinglong TNT upper limit DATE: 15/03/25 07:03:31 GMT FROM: L.P. Xin at NAOC 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 150323B (Cumming., GCN 17619; Kienlin., GCN 17623) with Xinglong 0.8-m TNT telescope at 2015-03-23, 18:19:24(UT), about 8.85 hour after the Swift trigger time. No any new source was detected in our 10*300sec coadded image within the errorbox of BAT (Cumming., GCN 17619), and the errorbox of two uncatalogured X-ray sources (Avanzo et al., 17632) down to the 3 sigma limit of 21.8 mag in R-band, calibrated by USNO B1.0 R2 mag, at the mean time of 9.28 hours after the burst. We noted that there was a source in USNO B1.0 catalog ( 17:21:50.446 +38:17:00.13 R2=20.5 mag ), which was located in the errorbox of the Source 2 (Avanzo et al., 17632), but the variation of its brightness was not decided. The message may be cited.