MASTER Net Optical Observations of the blazar B2 0619+33

ATel #2865; E. Gorbovskoy, V. Lipunov, V. Kornilov, A. Belinski, N. Shatskiy, N. Tyurina, D. Kuvshinov, P. Balanutsa, 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)
on 24 Sep 2010; 11:59 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Vladimir Lipunov (lipunov2007@gmail.com)

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Initially, we find 2 unfiltered post flare images in MASTER-Net data base of the blazar B2 0619+33 ( F.K. Schinzel, ATEL 2829, Kovalev et al. 2007, AJ 133, 1236, and 2831, 2848, 2849 ) at 15-16 sept 2010.

The reduction of the unfiltered images give:

UT
2010-09-15 23:37:53 m=18.42+-0.04
2010-09-16 00:17:42 m=18.38+-0.04

After that we have made 6 hours monitoring in R and V band at 21-22 sep night under the good weather condition but with bright Moon. We find optical decay from 17.1 to 17.5 in R band.

Between 2010-09-21 21:00 and 2010-09-21 02:00 (UT) light curve is well approximated as:

R = A + B (t - 21:00), with A= 17.22 +- 0.03, B = (-0.05+-0.01) hour^-1, t<02:00 22 sep

V = C + D (t - 21:00), with C= 17.7 +- 0.2, D = (0.014 +- 0.037) hour^-1 , t<02:00 22sep

The light curve is available at

http://observ.pereplet.ru/images/B2_0619_33/B2_0619_33.jpg

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