Аннотация:https://gcn.nasa.gov/circulars/42346The MASTER-OAFA robotic telescope of MASTER Global Robotic Net [1-4] started Fermi (GCN 42342) and Swift GRB 251018A (Gupta et al. GCN 42343, Trigger time 2025-10-18 03:12:02UT)105s after notice time (141s after trigger time) at 2025-10-18 03:14:24 UT (Lipunov et al. GCN 42344, cover map and OT https://master.sai.msu.ru/site/master2/observ.php?id=3017251There is MASTER OT J184810.01-370141.6,detected since first image (03:14:24) with m_OT=16.5 at 2025-10-18 03:16:46 (unfiltered, automatically calculated)This OT was discovered by Swift-UVOT (Gupta et al. GCN 42343) and observed by TRT (S.Y.Fu et al. GCN 42345) at the same time.Observation and reduction will be continued.[1] Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L[2] Lipunov et al. 2022, Universe, Vol. 8(5), id.271[3] Lipunov et a. 2019, ARep, vol.63, 293[4] Lipunov V., Kornilov V., Gorbovskoy E., Tiurina N., Kuznetsov A. 2023, Astronomical Robotic Networks and Operative Multichanel Astrophysics,Lomonosov MSU PRESS, 591pp.http://www.pereplet.ru/lipunov/625.html#625