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A. Antonelli, L. A. Sigua, L.O. Takalo, L. V. Larionova, M. I. Carnerero, M. Perri, M. R. Samal, M. Tavani, M. Villata, O. M. Kurtanidze, P. Cattaneo, P. Giommi, R. Bachev, S. Colafrancesco, S. G. Jorstad, Sh. A. Ehgamberdiev, S. O. Kurtanidze, S. Puccetti, S. Vercellone, T. S. Grishina, V. M. Larionov, V. Vittorini, W. P. Chen","submitted_at":"2018-03-20T17:13:51Z","abstract_excerpt":"We report the AGILE detection and the results of the multifrequency follow-up observations of a bright $\\gamma$-ray flare of the blazar 3C 279 in June 2015. We use AGILE-GRID and Fermi-LAT $\\gamma$-ray data, together with Swift-XRT, Swift-UVOT, and ground-based GASP-WEBT optical observations, including polarization information, to study the source variability and the overall spectral energy distribution during the $\\gamma$-ray flare. 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