MASTER 120939.35+560917.3 - SN candidat discovery

ATel #3122; P. Balanutsa, E. Gorbovskoy, V. Lipunov, V. Kornilov, A. Belinski, N. Shatskiy, N. Tyurina, D. Kuvshinov, V. Chazov, A. Kuznetsov, D. Zimnukhov, M. Kornilov (SAI, Moscow), A. Tlatov, A. V. Parhomenko, D. Dormidontov (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Yu. Sergienko, D. Varda (Blagoveshchensk Educational University), V. Krushinski, I. Zalozhnih, T. Kopytova, A. Popov (Ural State University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, V. Lenok, O. Chuvalaev, V. Poleschuk, O. Gres,(Irkutsk State University) , V. Shumkov, S. Shurpakov
on 26 Jan 2011; 14:39 UT
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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The MASTER auto-detection system at Tunka (Baykal Lake, Siberia) detected a new transient source at the position (R.A., Dec) 12h 09m 39.35s , +56d 09m 17s.3 (J2000) with a typical uncertainty of 0.5" at 2011-01-24 15:16:02 (UT) in SDSSJ120939.77+560923.9 galaxy. The OT was seen at older images from 23 Nov 2010. There is now minor planet and any object brighter 21 mag in DSS at this place. We have a number images this field without OT. Offset is 3.6W 6.6S from galaxy center.

The OT magnitude change from 15.5+-0.1 (29 Nov 2010) to 17.0 +-0.1 ( 23 Jan 2011).

It seems that OT is SN type luminous type II .

The spectral observations are needed.

The discovery image is available at http://observ.pereplet.ru/images/120939.35+560917.3/MASTER_OT_120939.35+560917.3.jpg