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Dickinson, H. Prokoph, INAF-IRA Bologna), I. Telezhinsky, J. D. Eisch, J. Finke (U.S. Naval Research Laboratory), J. Grube, J. Holder, J. Larsson, J. L. Richards, J. Perkins, J. P. Finley, J. Quinn, J. Rousselle, J. Tyler, J. V. Cardenzana, J. V. Tucci, K. Berger, K. Meagher, K. Ragan, L. Ciupik, L. Fortson, L. Gerard, M. Beilicke, M. Cerruti, M. Errando, M. J. Lang, M. Kertzman, M. Orienti (INAF-IRA Bologna), M. Pohl, M. Santander, N. Hakansson, P. Fortin, P. Kar, P. Moriarty, P. T. Reynolds, R. A. Ong, R. Bird, R. Mukherjee, R. Welsing, S. Kumar, S. P. Wakely, S. T. Griffiths, T. B. Humensky, T. Hovatta, V. Bugaev, V. V. Vassiliev, W. Benbow, W. Max-Moerbeck, X. Chen, Y. Khassen","submitted_at":"2014-10-27T08:12:53Z","abstract_excerpt":"We report on multifrequency observations performed during 2012 December-2013 August of the first narrow-line Seyfert 1 galaxy detected in gamma rays, PMN J0948+0022 ($z$ = 0.5846). 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