GCN Circular 15518
D. Xu (DARK/NBI), J.-Z. Liu, G.-J. Feng, H.-B. Niu, C.-H. Bai, A. Esamdin, L. Ma (XAO) report: We observed the field of GRB 131127A (Markwardt et al., GCN 15516) using 1m telescope located on Mt. Nanshan, Xinjiang, China. Observations started at 11:45:12 UT on 2013-11-27 (i.e., 1.56 hr after the BAT trigger) and a series of R-band frames were obtained. Within the SPER XRT error circle (http://www.swift.ac.uk/sper/) of this burst, no crediable optical source is detected down to a limiting magnitude of R=20.5 mag, calibrated with nearby USNO B1 field.