TITLE: GCN CIRCULAR NUMBER: 28229 SUBJECT: GRB 200806A: Nanshan/NEXT optical upper limit DATE: 20/08/08 06:35:51 GMT FROM: Dong Xu at NAOC/CAS S.Y. Fu, Z.P. Zhu, X. Liu, D. Xu (NAOC), X. Gao (Urumqi No.1 Senior High School), X. Zhang, J.Z. Liu (XAO) report: We observed the field of GRB 200806A (Ambrosiet al., GCN 28211) using the NEXT-0.6m telescope located at Nanshan, Xinjiang, China. We obtained 8x100s frames in the Sloan r-band, starting at 19:42:36 UT on 2020-08-07, i.e., 28.22 hr after the burst. No optical source is detected in our stacked image at the enhanced XRT position (Beardmore et al., GCN 28214), down to a limiting magnitude of r~20.2, calibrated with the nearby PanSTARRS field.