TITLE: GCN CIRCULAR NUMBER: 15788 SUBJECT: GRB 140206A: MASTER OT detection DATE: 14/02/06 11:08:00 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov Blagoveschensk Educational State University, Blagoveschensk E. Gorbovskoy, V. Lipunov, V.Kornilov, D.Kuvshinov, A.Belinski, N.Tyurina, N.Shatskiy, P.Balanutsa, D.Zimnukhov, A.Kuznetsov, V.V.Chazov, D.Denisenko, A.Sankovich Sternberg Astronomical Institute, Moscow State University K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Krushinski, I.Zalozhnih, A. Popov Ural Federal University, Kourovka A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Blagoveschensk was pointed to the GRB140206A (Lien et. al GCN 15784 , Gotz et. al GCN 15784) 2h 16m (8153 s) after trigger time at 2014-02-06 09:33:13 UT directly after sunset. On our first sets we found optical transient Oksanen et. al. GCN 15786. The coordinate is: RA= 09h 41m 20.21s DEC= +66d 45m 37.7s ERROR= 0.5 arcsec Mag=18.5 +- 0.25m Our unfiltered magnitude is calibrated by USNO B1.0 catalog by a parity 0.8R + 0.2B. The message may be cited.