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We report  Fermi  Large Area Telescope (LAT) observations of the radio‐loud active galactic nucleus SBS 0846+513 ( z  = 0.5835), optically classified as a narrow‐line Seyfert 1 galaxy, together with new and archival radio‐to‐X‐ray data. The source was not active at γ‐ray energies during the first two years of  Fermi  operation. A significant increase in activity was observed during 2010 October–2011 August. In particular, a strong γ‐ray flare was observed in 2011 June reaching an isotropic γ‐ray luminosity (0.1–300 GeV) of 1.0 × 10 48  erg s −1 , comparable to that of the brightest flat spectrum radio quasars, and showing spectral evolution in γ rays. An apparent superluminal velocity of (8.2 ± 1.5) c  in the jet was inferred from 2011 to 2012 Very Long Baseline Array (VLBA) images, suggesting the presence of a highly relativistic jet.  Both the power released by this object during the flaring activity and the apparent superluminal velocity are strong indications of the presence of a relativistic jet as powerful as those of blazars. In addition, variability and spectral properties in radio and γ‐ray bands indicate blazar‐like behaviour, suggesting that, except for some distinct optical characteristics, SBS 0846+513 could be considered as a young blazar at the low end of the blazar's black hole mass distribution.

SBS 0846+513: a new γ‐ray‐emitting narrow‐line Seyfert 1 galaxy