TITLE: GCN CIRCULAR NUMBER: 12007 SUBJECT: GRB 110422A: MASTER first 30 min OT light curve DATE: 11/05/05 06:42:02 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs O. Gres, K.Ivanov, V.A.Poleshchuk, S.Yazev, N.M.Budnev, O.Chuvalaev Irkutsk State University V.Krushinski, I.Zalozhnich, A. Popov Ural State University, Kourovka E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Kuznetsov, D.Zimnukhov, M. Kornilov, A.Sankovich Sternberg Astronomical Institute, Moscow State University A. Tlatov, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory V.Yurkov, Yu.Sergienko, D.Varda, I.Kudelina Blagoveschensk Educational State University, Blagoveschensk MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka (Baykal lake) was pointed to the GRB 110422A (Mangano et al., GCN Circ 11957) 53 sec after GRB time at 2011-04-22 15:42:48.507 UT (Gres et al., GCN Circ 11960). We see OT (Klunko et al. GCN 11958) on all images in both polarizations in R-band. The results of the our photometry are: mag err exp t-t_trig mag err exp t-t_trig R/ s mean (hours) R\ s mean (hours) 14.89 0.29 10 0.0166 15.28 0.43 10 0.0163 15.03 0.17 20 0.0272 15.3 0.25 20 0.0272 16.04 0.47 30 0.0400 15.73 0.31 30 0.0397 15.73 0.38 40 0.0551 15.77 0.38 40 0.0548 16.35 0.41 50 0.0729 16.05 0.27 50 0.0724 16.53 0.37 60 0.0938 16.53 0.32 60 0.0934 16.36 0.45 80 0.1190 16.35 0.41 80 0.1186 16.68 0.34 100 0.1502 16.78 0.33 100 0.1498 17.74 0.79 120 0.1871 17.17 0.34 120 0.1868 17.78 0.59 150 0.2319 17.52 0.33 150 0.2315 17.26 0.3 180 0.2834 17.56 0.32 180 0.2831 17.22 0.33 180 0.3403 17.78 0.48 180 0.3399 17.2 0.32 180 0.3957 18.32 0.87 180 0.3952 17.59 0.45 180 0.4513 18.71 1.27 180 0.4510 18.08 0.91 180 0.5066 19.25 2.64 180 0.5063 The LC's are available at: http://observ.pereplet.ru/images/GRB110422/grb110422.png The message may be cited.