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Nuss, E. Orlando, E. Siskind, E. Torresi, E. Troja, F. D'Ammando, F. Gargano, F. Giordano, F. Longo, F. Loparco, F. Piron, F. Schinzel, F. Spada, G. Barbiellini, G. Caliandro, G. Chiaro, G. Godfrey, G. J'ohannesson, G. Madejski, G. Mura, G. Pivato, G. Spandre, G. Tosti, G. Vianello, H. Takahashi, I. Grenier, I. Moskalenko, J. Ballet, J. Bregeon, J. Casandjian, J. Chiang, J. Cohen-Tanugi, J. Conrad, J. Finke, J. Gonzalez, J. Grove, J. Kataoka, J. Li, J. McEnery, J. Perkins, J. Thayer, J.W. Hewitt, K. Sokolovsky, K. Wood, L. Baldini, L. Cominsky, L. Fuhrmann, L. Latronico, L. Li, L. Stawarz, L. Tibaldo, L. Venere, M. Ackermann, M. Ajello, M. Caragiulo, M. Giroletti, M. Kuss, M. Lovellette, M. Mayer, M. Mazziotta, M. Monzani, M. Ohno, M. Orienti, M. Pesce-Rollins, M. Razzano, M. Schaal, N. Giglietto, N. Omodei, O. Reimer, P. Bruel, P. Caraveo, P. Drell, P. Fusco, P. Giommi, P. Lubrano, P. Michelson, P. Spinelli, R. Bellazzini, R. Blandford, R. Bonino, R. Britto, R. Buehler, R. Cameron, R. Claus, R. d'Abrusco, R. Desiante, R. Ojha, R. Rando, R. Romani, S. Buson, S. Ciprini, S. Cutini, S. Digel, S. Fegan, S. Guiriec, S. Larsson, S. Murgia, S. Rain`o, S. Razzaque, S. Zimmer, T. Brandt, T. Glanzman, T. Mizuno, T. Ohsugi, T. Porter, T. Takahashi, W. Atwood, W. Focke, W. Johnson, Y. Tanaka, Y. Uchiyama","submitted_at":"2015-01-24T15:38:21Z","abstract_excerpt":"The third catalog of active galactic nuclei (AGNs) detected by the Fermi-LAT (3LAC) is presented. It is based on the third Fermi-LAT catalog (3FGL) of sources detected between 100 MeV and 300 GeV with a Test Statistic (TS) greater than 25, between 2008 August 4 and 2012 July 31. The 3LAC includes 1591 AGNs located at high Galactic latitudes (|b|>10{\\deg}), a 71% increase over the second catalog based on 2 years of data. There are 28 duplicate associations, thus 1563 of the 2192 high-latitude gamma-ray sources of the 3FGL catalog are AGNs. Most of them (98%) are blazars. 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