Рубрика: Новости

Astronomer’s Telegram #3700
D. Blinov, D. Morozova, V. Larionov (St. Petersburg Univ., Russia)
on 22 Oct 2011; 03:12 UT

Our optical photometric monitroring, made as a part of GASP/WEBT project, reveals fast and high amplitude brightening of BL Lac object S5 0716+714. The blazar had R=12.50 on 2011-10-21UT20, one magnitude brighter than our previous estimate R=13.59 on 2011-10-18UT23. At the same time Fermi LAT daily integrated light curve shows historical maximum for this object 1.5e-6 ph cm^-2s^-1 (E>100MeV). Since the optical flux is still rising, observations in all wavelengths are strongly encouraged. Optical preliminary light curve could be found here: https://vo.astro.spbu.ru/optic/s50716R.png. Fermi LAT open access daily light curve for this source: http://fermi.gsfc.nasa.gov/FTP/glast/data/lat/catalogs/asp/current/lightcurves/0716+714_86400.png

We perform optical photometric and R-band polarimetric monitoring of BL Lac object OJ 287 using 70-cm AZT-8 (CrAO, Ukraine) and 0.4-m LX-200 (St.Petersburg, Russia) telescopes, as a part of GASP/WEBT project. As reported in Atel#3680, this blazar was found by Fermi LAT in active state on 2011 October 10. Our data show that a sharp optical maximum was reached on the date 2011-10-07UT03, R=14.19, while on 2011-10-10UT02 R=14.74. Meanwhile highest optical polarization p= 21% was reached even before the optical maximum, in the night of October 6. Current high activity state of OJ287, with unexpected sign of time lag between optical and gamma-rays, deserves close attention in all wavelengths.

Astronomer’s Telegram #3681
V. Larionov, D. Morozova, E. Larionova, D. Blinov (St. Petersburg Univ., Russia)
on 13 Oct 2011; 13:14 UT