What can the 2008/10 broadband flare of PKS 1502+106 tell us? Nuclear opacity, magnetic fields, and the location of gamma rays

Understand

Context.

• The origin of blazar variability, seen from radio up to gamma rays, is still a heavily debated matter and broadband flares offer a unique testbed towards a better understanding of these extreme objects.
• Such an energetic outburst was detected by Fermi/LAT in 2008 from the blazar PKS 1502+106.
• The outburst was observed from gamma rays down to radio frequencies.