We report multi-wavelength ( IR-O , UV , X–ray , \gamma –ray ) data from the flat spectrum radio quasar ( FSRQ ) PKS B1424-418 ( z = 1.52 ) gathered during an active phase in 2013 April .
As for a few other cases of FSRQs reported in literature , the detection by the Large Area Telescope onboard Fermi of \gamma rays with energy above 10 GeV indicates that the emission likely occurs beyond the highly opaque ( \tau \sim 10 ) broad line region .
This conclusion is strengthened by a model fit to the spectral energy distribution , which allows us to locate the emission region even beyond the distance generally assumed for the dusty torus .
The consequent large size ( \sim 1 pc ) inferred for the emission region can not account for the observed daily-scale variability of the \gamma –ray flux .
We discuss the possibility that short-term variability results from fast magnetic reconnection events , as proposed in recent works .