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In 2008, AGILE and Fermi detected gamma‐ray flaring activity from the unidentified EGRET source 3EG J1236+0457, recently associated with a flat spectrum radio quasar (GB6 J1239+0443) at z = 1.762. The optical counterpart of the gamma‐ray source underwent a flux enhancement of a factor of 15–30 in six years, and of ∼10 in six months. We interpret this flare‐up in terms of a transition from an accretion‐disc‐dominated...
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