TITLE: GCN CIRCULAR NUMBER: 41163 SUBJECT: GRB 250725A: Global MASTER-Net: First Optical Synchronous Observatios of Short GRB. DATE: 25/07/25 13:30:56 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> V.M.Lipunov (Lomonosov MSU, SAI, Moscow), E.Gorbovskoy, N.Tiurina, A.Kuznetsov, A.Sankovich, G.Antipov, P.Balanutsa, P. Rudominskaya, A.Chasovnikov, V.Topolev, K.Zhirkov, Ya.Kechin, V.Senik, D.Vlasenko (Lomonosov MSU), C.Francile, F. Podesta, R.Podesta, E. Gonzalez (OAFA), D.Buckley, (SAAO, South Africa) O.Gress, N.Budnev (ISU, Irkutsk), A.Sosnovskij (Crao RAS), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity), V.M.Pillet (The Instituto de Astrofisica de Canarias, Spain), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory, Mexico) MASTER-OAFA robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov,V.G. Kornilov, E.S. Gorbovskoy, N.V. Tyurina, A.S. Kuznetsov, "ASTRONOMICAL ROBOTIC NETWORKS and OPERATIVE MULTICHANNEL ASTROPHYSICS. Based on the example of the global MASTER network.", The Moscow State University Publishing House. In the series "Works of Outstanding Scientists of Moscow State University", http://www.pereplet.ru/lipunov/625.html#625) located in Argentina (Rudominskaya et al., GCN 41157) and in the South Africa, SAAO; Busckley et al., GCN 41151;) was pointed to the GRB250725A (Fermi GBM 41150, Swift GCN 41152). As we noted out the earlier (Rudominskaya et al., GCN 41157), the gamma-ray burst turned out to be a short GRB (Thakur et al., GCN 41160). Thus, we have images before, during and after GRB250725A. Now the processing of wide-field and polarized frames continues. See also optical observations by Li et al. GCN 41158; Perez-Garcia et al. GCN 41159. The message may be cited. View this GCN Circular online at https://gcn.nasa.gov/circulars/41163. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...