D'AMMANDO, FILIPPOFILIPPOD'AMMANDOORIENTI, MonicaMonicaORIENTILarsson, J.J.LarssonGIROLETTI, MARCELLOMARCELLOGIROLETTI2020-04-222020-04-2220150035-8711http://hdl.handle.net/20.500.12386/24171We report the discovery of γ-ray emission from the narrow-line Seyfert 1 (NLSy1) galaxy FBQS J1644+2619 by the Large Area Telescope on board the Fermi satellite. The Third Fermi LAT Source catalogue reports an unidentified γ-ray source, detected over the first four years of Fermi operation, 0.23° from the radio position of the NLSy1. Analysing 76 months of γ-ray data (2008 August 4-2014 December 31) we are able to better constrain the localization of the γ-ray source. The new position of the γ-ray source is 0.05° from FBQS J1644+2619, suggesting a spatial association with the NLSy1. This is the sixth NLSy1 detected at high significance by Fermi-LAT so far. Notably, a significant increase of activity was observed in γ-rays from FBQS J1644+2619 during 2012 July-October, and an increase of activity in the V band was detected by the Catalina Real-Time Sky Survey in the same period.STAMPAenArticle10.1093/mnras/stv12782-s2.0-84940026093000360851100038http://arxiv.org/abs/1503.08226v2https://academic.oup.com/mnras/article/452/1/520/17495052015MNRAS.452..520DFIS/05 - ASTRONOMIA E ASTROFISICA