TITLE: GCN CIRCULAR NUMBER: 38756 SUBJECT: GRB 250101A: MASTER earlier OT observations with SOSS emission features DATE: 25/01/01 15:23:19 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru> N.Budnev (ISU, V.Lipunov, (Lomonosov MSU), O.Gress (ISU), I.Panchenko, A.Kuznetsov, P.Balanutsa, K.Zhirkov, V.Topolev, A.Chasovnikov, N.Tiurina, Ya.Kechin, G.Antipov, E.Gorbovskoy, D.Vlasenko, A.Sankovich, V.Senik (Lomonosov MSU), A.Sosnovskij (CrAO RAS), D.Buckley (SAAO), R.Rebolo (The Instituto de Astrofisica de Canarias), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity) L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), MASTER Global robotic net (http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L) started observation (Lipunov et al. GCN 38751) of Swift GRB 240101A(Page et al. GCN 38752) 35 sec after notice time (86 sec after trigger time) at 2025-01-01 13:24:16 UT at MASTER-Tunka, see limits map https://master.sai.msu.ru/site/master2/observ.php?id=2730214 . There is MASTER OT J022816.52+191139.9 , discovered by Swift (GCN 38752) since 1st image. We see Smooth Optical Self-similar Emission of this Gamma-Ray Burst (SOSS-emission, Lipunov et al. 2017, ApJ, 845, id9 https://ui.adsabs.harvard.edu/abs/2017ApJ...845...52L/abstract ) Observations and reduction will be continued. View this GCN Circular online at https://gcn.nasa.gov/circulars/38756. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...