TITLE: GCN CIRCULAR NUMBER: 25524 SUBJECT: GRB 190828B: Dabancheng-0.5m optical upper limit DATE: 19/08/28 16:31:06 GMT FROM: Dong Xu at NAOC/CAS B.Y. Yu, X. Liu, D. Xu, Z.P. Zhu (NAOC), J.H. Liu (XAO), X. Gao (Urumqi No.1 Senior High School), Z.B. Zhang (XJTS) report: We observed the field of GRB 190828B (Dichiara et al., GCN 25517) using the Half-Meter Telescope (HMT-0.5m) located at Dabancheng, Xinjiang, China. We obtained 5x60 s unfiltered frames, started at 13:56:32 UT on 2019-08-28, i.e., 56.5 min after the burst. No optical source is detected at the XRT position (Dichiara et al., GCN25517) in our stacked image, down to a limiting magnitude of R~17.8, calibrated with the nearby SDSS field.