TITLE: GCN CIRCULAR NUMBER: 26145 SUBJECT: GRB 191101A: iTelescope optical limit DATE: 19/11/02 10:01:01 GMT FROM: Albert Kong at NTHU A.K.H. Kong (NTHU, Taiwan) reports We observed the field of GRB 191101A (D'Ai et al. GCN 26135) with the T11 0.5m telescope of iTelescope.Net in New Mexico. The observation was done with a luminance filter (400-700 nm) beginning at 2019-11-02 02:08:44 UT (5 hours after the trigger) for 300 sec. At the position of the enhanced X-ray afterglow (Evans et al. GCN 26137), we do not detect any optical emission with a detection limit of about 19.5 mag by comparing with the Gaia DR2 catalogue.