M. Otulakowska-Hypka (NCAC, Warsaw)
based on Patterson et al. (2013; arXiv:1212.5836)
M. Bejger (NCAC, Warsaw)
based on Birnholtz & Piran, arXiv:1302.5713
E. Łokas (NCAC, Warsaw)
based on van der Marel et al. (2012, ApJ, 753, 9) and other papers
M. Janiak (NCAC, Warsaw)
based on Kalashev, Kusenko and Essey, arXiv:1303.0300
A. Barnacka (NCAC, Warsaw)
based on: Fermi-LAT Collaboration arXiv:1008.3912, ATel#4224 and ATel#4284;
A. Zdziarski (NCAC, Warsaw)