Britzen S.; Qian S.; Witzel A.; Krichbaum T.; Aller M.; Aller H.; Kurtanidze O.; Vercellone S.; Richter G.
(2013)
Context. 2251+158 (3C 454.3) is a well-studied quasar with rather unusual properties. It is among the most variable and brightest gamma-ray emitting active galactic nucleus (AGN) in the sky observed by Fermi. The ...