TITLE: GCN CIRCULAR NUMBER: 12762 SUBJECT: FERMI GRB111228.45: MASTER observations DATE: 11/12/29 12:19:05 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda, Blagoveschensk Educational State University, Blagoveschensk E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich, S. Shurpakov Sternberg Astronomical Institute, Moscow State University K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,E.Konstantinov, Irkutsk State University A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka 2 cameras MASTER VFW (FOV=2x420 sq.deg.) located in Blagoveschensk made observations synchronously with this GRB111228.45 (Trigger Number 346779932) from it cover 3-sigma error-box. The detailed map of a covering is available here http://master.sai.msu.ru/static/GRB/Amur/FERMI/Amur.grb_1_235392.png and on following table 1 Table 1. Synchronous GRB observations ID_CAM ID_SET RA. [deg] Dec.[deg] Limit Exptime 29009 21381 21.566667 21.999722 11.5 5.00 100627 3913 15.201755 18.989718 11.5 5.00 MASTER-2 and MASTER VFW pointed to GRB111228.45 54 sec after the trigger time and 24 sec after the notice time. The MASTER-2 (FOV=4 sq.deg.) first image upper limit is 15. 7 . MASTER VWF cover 1 and 3 sigma errorboxes.The detailed map of a covering is available here http://master.sai.msu.ru/static/GRB/Amur/FERMI/Amur.grb_2_235392.png and on following table 2: Table 2. GRB follow up observations. ID_CAM ID_SET RA. [deg] Dec.[deg] Limit Exptime 29009 21382 346.616940 9.675031 11.2 5.00 100627 3914 335.179167 10.132500 11.2 5.00 The reduction is continuated. The message may be cited.