Аннотация:https://gcn.nasa.gov/circulars/41893MASTER Global robotic Net (Lipunov et al. 2010) started Fermi GRB 250919A(GBM GCN 41874, GCN 41876, GCN 41890; LAT GCN 41884, Ttrigger=00:28:52)observation in alert mode (Lipunov et al. GCN 41875)at MASTER-OAFA and continued as EP GRB 250919 (GCN 41879) since its notice time (Lipunov et al. 41880)Bright optical counterpart MASTER OT J195412.89-485016.4 was detected with peak structure light curve.24h after GRB detection (GCN 41874) this optical counterpart has unfiltered m_OT~18.3