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We report about the multiwavelength campaign on the Narrow-Line Seyfert 1(NLS1) Galaxy PMN J0948+0022 (z = 0.5846) performed in 2010 July-September andtriggered by high activity as measured by Fermi/LAT. The peak luminosity in the0.1-100 GeV energy band exceeded, for the first time in this type of source,the value of 10^48 erg/s, a level comparable to the most powerful blazars. Thecomparison of the spectral energy distribution of the NLS1 PMN J0948+0022 withthat of a typical blazar - like 3C 273 - shows that the power emitted at gammarays is extreme.

The July 2010 outburst of the NLS1 PMN J0948+0022