TITLE: GCN CIRCULAR NUMBER: 12811 SUBJECT: GRB 120106A: MASTER-Tunka optical observations DATE: 12/01/06 15:36:39 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev,E.Konstantinov, Irkutsk State University 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 Moscow State University, Sternberg Astronomical Institute V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka E. Sinykov, V.Yurkov, Yu.Sergienko, D.Varda, Blagoveschensk Educational State University, Blagoveschensk A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory MASTER II robotic double telescope (MASTER-Net: http://observ.pereplet.ru) located at Tunka (Baykal) was pointed to the 120106A (Immler et al., GCN Circ 12810) 19 s after notice time and 46 sec after GRB time at 14:16:24.24 UT. On our first (10s exposure) west telescope image (| polasizations) we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 15.8 mag. On our first (10s exposure) east telescope image (- polasizations) we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 15.9 mag. The message may be cited.