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MASTER discovery of the 12% optical polarization of the gamma-ray flaring BL Lac CGRaBS J0211+1051

ATel #3134; E. Gorbovskoy, P, Balanutsa, V. Lipunov,,V. Kornilov, A. Belinski, N. Shatskiy, N. Tyurina, D. Kuvshinov, V. Chazov, A. Kuznetsov, D. Zimnukhov, M. Kornilov, Gareeva, D. (SAI, Moscow), A. Tlatov, A. V. Parhomenko, D. Dormidontov (Kislovodsk solar station of the Pulkovo observatory RAS), V. Yurkov, Yu. Sergienko, I. Kudelina, D. Varda (Blagoveshchensk Educational University), V. Krushinski, I. Zalozhnih, A. Popov (Ural State University), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleschuk, O. Gres,(Irkutsk State University) , V. Shumkov, S. Shurpakov (MASTER team members)
on 30 Jan 2011; 18:02 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

Subjects: Optical, >GeV, Blazar

Referred to by ATel #: 3136

Following the gamma-ray flare of the BL Lac object CGRaBS J0211+1051 (also known as MG1 J021114+1051, and 1FGL J0211.2+1049, Abdo et al. 2010, ApJS, 188, 405) detected by Fermi LAT on 2011 January 23 (ATel #3120), we performed 1 hour a MASTER polarization observations on 2011 January 28 in V-band.

We observed BL Lac object simultaneously from two sites of the MASTER-Net: Tunka-Baykal and Amur-Blagoveschensk separated by 1500 km at Russian Far East.

There are 2 perpendicular linear polarizators on both sites diclaned 45 degrees relatively each others. The telescopes and CCD are completely identical.

12% linear polarizarion was dedected.

Date Polarizator mag Error Filter Site
245559.0 \ 13.603 0.009 V+P Tunka-Baykal
245559.0 / 13.853 0.002 V+P Tunka-Baykal
245559.0 - 13.734 0.010 V+P Amur-Blagoveschensk
245559.0 | 13.751 0.010 V+P Amur-Blagoveschensk

The transparency in Blagoveschensk was wars than Tunka.

The polarizations of the references stars less than 1%.

MASTER Robotic Net