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We report the discovery of a Narrow Line QSO located at about 1.3' from theBroad Line Radio Galaxy 3C445. The source,1WGA J2223.7-0206, although alreadyrevealed by ROSAT has never been optically identified previously. An XMM-Newtonobservation of 3C445 has allowed, for the first time, an accurate X-rayspectral study of 1WGA J2223.7-0206, revealing an ultra-soft spectrum and fastflux variations typical of Narrow Line AGN. The 0.2-10 keV spectrum is wellrepresented by a power law (Gamma=2.5) plus a black body component (kT = 117eV) absorbed by Galactic NH. About 80% of the X-ray flux is emitted below 2keV. The 0.2-2 keV flux is observed to decrease by about a factor 1.6 in about5000 s. The optical observations, triggered by the X-ray study, confirm theNarrow Line AGN nature of this source. The continuum is blue with typical AGNemission lines, pointing to a redshift z=0.46. The full width half maximum ofH_beta is 2000 km/secand the flux rat io [OIII}]/H_beta=0.21. The opticalluminosity (M_R=-23.2) and the point-like appearance in the optical imagesidentify 1WGA J2223.7-0206 as a Narrow Line QSO. From the optical-UV-X-raySpectral Energy Distribution we obtain a lower limit of the bolometricluminosity of 1WGA J2223.7-0206 (L_bol > 3 10^{45} erg/sec) implying, foraccretion rates close to the Eddington limit, a black hole mass M_BH > 2.4 x10^{7} M_{\odot}Comment: 6 pages, 5 figures, accepted by A&A, removed pag. 7 containing a  duplication of Fig.

1WGA J2223.7-0206: A Narrow-Line Quasi-Stellar Object in theXMM-Newtonfield of view of 3C 445