The July 2010 outburst of the NLS1 PMN J0948+0022
  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 and triggered by high activity as measured by Fermi/LAT. The peak luminosity in the 0.1-100 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. The comparison of the spectral energy distribution of the NLS1 PMN J0948+0022 with that of a typical blazar - like 3C 273 - shows that the power emitted at gamma rays is extreme. 
L. Foschini, G. Ghisellini, L. Maraschi, G. Tagliaferri, F. Tavecchio,   Y. Y. Kovalev, Yu. A. Kovalev, M. L. Lister, J. L. ...
astro-ph.HE