Аннотация:https://gcn.nasa.gov/circulars/41806MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru,Argentina started Swift GRB 250911A (Klingler et al. GCN 41781) observations automatically at 2025-09-11 02:25:44UT and in own planner mode befor it.There is GRB optical counterpart MASTER OT J173500.02-165114.40 with mOT~18.81at Swift position (XRT Perri et al. GCN 41783, Beardmore et al. GCN 41784, Dichiara et al. GCN 41804;UVOT Siegel et al. GCN 41800), first reported by COLIBRI (Angula et al. GCN 41782).