TITLE: GCN CIRCULAR NUMBER: 12687 SUBJECT: GRB 111215A: MASTER-Net optical prompt and follow up observations DATE: 11/12/15 17:53:12 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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 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 V.Krushinski, I.Zalozhnich, T.Kopytova, A. Popov Ural State University, Kourovka 3 Robotic telescopes MASTER II was pointing to the GRB111215A (Oates et al., GCN CIRCULAR NUMBER: 12681). Two very wide field cameras was observed Swift error box before, during and after GRB trigger time. MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka(Siberia) was pointed to the GRB111215A 26 sec s after notice time and 381 sec after GRB time at 2011-12-15 14:10:29.44 UT in two polarizarions. On our first (80s exposure) set we haven`t found optical transient within SWIFT error-box (ra=23 18 12 dec=+32 28 47 r=0.050000). The 5-sigma upper limit has been about 18.8 mag MASTER II robotic telescope located in MASTER-Amur was pointed to the GRB111215A 214 sec s after notice time and 567 sec after GRB time at 2011-12-15 14:13:35.289 UT in two diagonal polarizarions. On our first (110s exposure) set we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 17.5 mag MASTER II robotic telescope located near Kislovodsk was pointed to the GRB111215A 7655 sec s after notice time and 8007 sec after GRB time at 2011-12-15 16:17:35.91 UT (time delay is so long due to weather conditions). On our first (180s exposure) set we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 18.1 mag Two MASTER Very Wide Field Cameras located at Tunka (D=68 mm, 420 square degrees, 11 Mpx) was observed GRB error box with 5 s exposure befoure, during and after GRB Trigger Time without time gap between images. Our unfiltered images are calibrated relative to Tycho stars (V). The magnitude limit of the each emage is 12.0 m at the edge of FOW. We do not detect OT. The video from MASTER VWF cameras is available at http://master.sai.msu.ru/static/GRB111215/grb111215.html The reduction is continuated. The message may be cited.