TITLE: GCN CIRCULAR NUMBER: 16915 SUBJECT: GRB 141015A: LCO-McDonald observations DATE: 14/10/15 20:50:22 GMT FROM: Andrea Melandri at INAF-OAB J. Japelj (U. Ljubljana) and C. Guidorzi (U. Ferrara) on behalf of a large collaboration report: We observed the position of GRB 141015A (Troja et al. GCN Circ. 16909) with the 1-m McDonald telescope (Fort Davis, US), a member of the Las Cumbres Observatory network. Observations started on October 15 at 09:51:01 UT, i.e., 38 minutes after the GRB trigger time (GCN Circ. 16909) and were done with the g', r' and i' filters. We did not find a new source within the enhanced XRT error circle (Evans et al. GCN Circ. 16913) down to the following limits: Mid time from Total Exp Filter Magnitude trigger (min) (s) ----------------------------------------------------------- 54.4 600 r' > 19.6 59.2 600 i' > 18.7 ----------------------------------------------------------- Magnitudes are calibrated against nearby USNO-B1 stars.