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Flat spectrum radio quasars (FSRQs) can suffer strong absorption above E =25/(1+z) GeV, due to gamma-gamma interaction if the emitting region is atsub-parsec scale from the super-massive black hole (SMBH). Gamma-ray flaresfrom these astrophysical sources can investigate the location of thehigh-energy emission region and the physics of the radiating processes. Wepresent a remarkable gamma-ray flaring activity from FSRQ PKS 2023-07 duringApril 2016, as detected by both AGILE and Fermi satellites. An intensivemulti-wavelength campaign, triggered by Swift, covered the entire duration ofthe flaring activity, including the peak gamma-ray activity. We report theresults of multiwavelength observations of the blazar. We found that, duringthe peak emission, the most energetic photon had an energy of 44 GeV, puttingstrong constraints on the opacity of the gamma-ray dissipation region. Theoverall Spectral Energy Distribution (SED) is interpreted in terms of leptonicmodels for blazar jet, with the emission site located beyond the Broad LineRegion (BLR).

The mid-2016 flaring activity of the flat spectrum radio quasar PKS 2023-07