Possibly the most powerful persistent object in the Universe detected by MASTER

ATel #6096; P. Balanutsa, D. Denisenko, V. Lipunov, E. Gorbovskoy, N. Tiurina, V. Kornilov, N. Shatskiy, V. Chazov, A. Kuznetsov, V. Vladimirov, V. Yecheistov (Moscow State University, SAI), K. Ivanov, S. Yazev, N. Budnev, E. Konstantinov, O. Chuvalaev, V. Poleshchuk, O. Gress (Irkutsk State University), V. Yurkov, Y. Sergienko, D. Varda, E. Sinyakov, A. Gabovich (Blagoveshchensk Educational University), A. Parkhomenko, A. Tlatov, D. Dormidontov, V. Senik (Kislovodsk Solar Station of Pulkovo Observatory), V. Krushinsky, I. Zalozhnih, A. Popov, A. Bourdanov (Ural Federal University), P. Podvorotny, V. Shumkov, S. Shurpakov (MASTER team members), H. Levato, C. Saffe (ICATE), C. Mallamaci, C. Lopez, F. Podest (OAFA)
on 24 Apr 2014; 15:45 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

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Further brightening of blazar CGRaBS J0809+5341 (z=2.133) to M=-30.5 observed by MASTER

Following the announcement of flare in flat spectrum radio quasar CGRaBS J0809+5341 detected by MASTER-Amur on 2014 Apr. 13 (see ATel #6070), this area of sky in Lynx was observed by the identical MASTER-Tunka telescope on Apr. 19. The object has brightened by yet another 0.5 magnitude, reaching 15.7m on 2014-04-19.588 UT. Using the currently adopted cosmological parameters (Hubble's constant H₀=67 km/s/Mpc, Ω_m=0.32, Ω_Λ=0.68), the photometric distance modulus (m-M) of CGRaBS J0809+5341 equals to 46.2 which corresponds to the absolute magnitude M=-30.0 on April 13th and M=-30.5 on April 19th. This intrinsic brightness is record high for the persistent objects (quasars and blazars), see for example the absolute magnitude distribution of SDSS quasars in Schneider et al., 2010 (Astron. J. Vol. 139, p. 2360).

The brightest known blazar APM 08279+5255 (z=3.911) has similar intrinsic brightness (M~-30.5) which is magnified by the gravitational lensing to M=-32.5 (m=15.4). However, the exact magnification factor due to lensing in APM 08279+5255 is unknown: various authors are giving estimates from 20-40x (~3-4m) to 6-10x (2-2.5m).

Multiwavelength observations are strongly encouraged. The comparison of MASTER-Tunka images in April 2014 (flare) and March 2011 (quiescence) together with the SDSS color image is posted at http://master.sai.msu.ru/static/OT/J080941+534124-MASTER-SDSS.jpg

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