TITLE: GCN CIRCULAR NUMBER: 11767 SUBJECT: GRB GRB 110223A: MASTER VWF early optical observations DATE: 11/02/24 16:32:33 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk K.Ivanov, O.Chuvalaev, V.Poleschuk, E.Konstantinov, V.Lenok, O.Gres, S.Yazev, N.M.Budnev, Irkutsk State University E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, V.Shumkov, S.Shurpakov Sternberg Astronomical Institute, Moscow State University V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory MASTER II robotic telescopes (MASTER-Net: http://observ.pereplet.ru) located in Amur-Blagoveschensk was pointed to the GRB110223A 7sec after notice time and 147 sec after GRB time. Unfortunately, main telescopes was not in focus. But we have images from Very Wide Filed Cameras mounted on telescope. On our first (5s exposure) set we haven`t found optical transient within SWIFT-BAT error-box (Littlejohns et al., GCN Curc 11761) brighter 12 mag (unfiltered). 12 coaded first images give limit 13 mag (mean time ~ 177 sec after trigger). The message may be cited. The first image is available at http://observ.pereplet.ru/images/GRB110223A/first.jpg There is Polar star at right botom angle of the image. mailto: lipunov@sai.msu.ru