Blazars S5 0716+71 and B3 1633+38 in unprecedented outbursts

Astronomer's Telegram #6942 ; A. A. Arkharov (Pulkovo Observatory), G. A. Borman (Crimean Observatory), A. Di Paola (INAF-Rome), V. M. Larionov, D. A. Morozova (St. Petersburg University)

on 17 Jan 2015; 14:08 UT

Subjects: Infra-Red, Optical, Gamma Ray, AGN, Blazar

Referred to by ATel #: 6944, 6953, 6954

We perform optical and near-infrared monitoring of selected gamma-bright blazars using 40-cm LX-200 (optical, St.Petersburg, Russia), 70-cm AZT-8 (optical, Crimea) and 1.1-m AZT-24 (near-infrared, Campo Imperatore, Italy), as a part of WEBT/GASP project. We report that blazars S5 0716+71 and B3 1633+38 (=4C 38.41) demonstrate violent activity during last nights, both being brighter than ever during last ten years. S5 0716+71 brightened in J band from 11.71 to 10.54 mag from 2014 December 23 (our last pre-outburst observation) to 2015 January 15. In R band it brightened from 12.40 (2015 January 14) to 11.80 (January 16). B3 1633+38 reached a value of J=12.99 (2015 January 15), as compared to J=16.26 at 2014 October 25. Its optical brightening is also reported by Danilet et al., ATel#6930 . Our preliminary NIR light curves may be seen for B3 1633+38 at this page and for S5 0716+71 here. Current high activity state of these blazars deserves close attention in all wavelengths.