Аннотация:https://gcn.nasa.gov/circulars/41558MASTER-OAFA robotic telescope (Lipunov et al. GCN 41556)started EP GRB 250827A observation at 2025-08-27 07:46:54 UTand detected optical couterpart of this GRBMASTER OT J001352.27-562952.8 with m_OT (unfiltered) = 18.9m (preliminary) at 2025-08-27 07:48:10 https://master.sai.msu.ru/site/master2/event.php?id=2978010 The light curve demonstrates multipeak structure from 18 to 19 during last hour.This OT coincide with GEMINI-South detection ( GCN 41554 Levan et al.) and Las Cumbres one (GCN 41555 Wenxiong Li et al.)