TITLE: GCN GRB OBSERVATION REPORT NUMBER: 3883 SUBJECT: GRB050824: MASTER final analysis of the OT observations DATE: 05/08/25 20:26:17 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, A.Krylov, N.Tyurina, A.Belinski, E.Gorbovskoy, D.Kuvshinov, G.Borisov, V.Vladimirov, G.Antipov, Krushinski V. Sternberg Astronomical Institute, Moscow Union "Optic" MASTER (http://observ.pereplet.ru) responded to GRB 050824 (Swift trigger 151905) (see GCN3869). The first image was 764 sec after SWIFT GRB050824 detection under the Moon light. We see OT-candidate proposed by J. Gorosabel (GCN 3865). Our m = 0.89R + 0.11B (R & B from USNO A2). We made new reduction and confirm previous our OT-decay result (GCN3870): New reduction give next results about OT: UT After GRB m error expotime mean time 23 25 00 788s >17.8 45 s 23 25 00 - 23 47 55 24.0 min 18.6 +-0.3 15x30 s 23 49 00 - 00 09 35 47.0 min 19.4 +-0.3 15x30 s The JPG-images available at http://observ.pereplet.ru/images/GRB050824/1.jpg . This work is supported by RFFI 04-02-16411 grant. This message can be cited. Mailto: lipunov@sai.msu.ru