GCN Circular 15947
D. Xu (DARK/NBI), C.-H. Bai, X. Zhang, A. Esamdin, L. Ma (XAO) report: We observed the BAT error circle of GRB 140311A (Racusin et al., GCN 15944) using the 1m telescope located in Nanshan, Xinjiang, China. Observations started at 21:26:44 UT on 2014-03-11 and some R-band frames were obtained. A seemingly varying optical source is clearly detected in each image at coordinates R.A. (J2000) = 13:57:13.27 Dec. (J2000) = +00:38:31.07 Uncertainty radius: ~1 aecsec This object is not present in both SDSS and DSS. We thus suggest it may be the afterglow of the burst. Observations are ongoing.