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Foschini, L. Fuhrmann, L. Gallo, L. Maraschi, M. Giroletti, M. Kino, M. L. Lister, M. Tornikoski, O. Tibolla, S. Komossa, T. Hovatta, T. J. Pearson, T. P. Krichbaum, T. S. Hamilton, V. Braito, W. Max-Moerbeck, Y. Y. Kovalev","submitted_at":"2012-09-26T08:31:47Z","abstract_excerpt":"We present more than three years of observations at different frequencies, from radio to high-energy gamma-rays, of the Narrow-Line Seyfert 1 (NLS1) Galaxy PMN J0948+0022 (z=0.585). This source is the first NLS1 detected at energies above 100 MeV and therefore can be considered the prototype of this emerging new class of gamma-ray emitting active galactic nuclei (AGN). 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