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We report on the identification of the gamma‐ray source 0FGL J20001.0+4352 listed in the  Fermi  bright source catalogue. This object, which has an observed 1–100 GeV flux of  (7.8 ± 1.2) × 10 −9  ph cm −2  s −1   and is located close to the Galactic plane, is not associated with any previously known high‐energy source. We use archival  XMM–Newton  and  Swift /X‐ray Telescope (XRT) data to localize with arcsec accuracy the X‐ray counterpart of this GeV emitter and to characterize its X‐ray properties: the source is bright (the 0.2–12 keV flux is  1.9 × 10 −12  erg cm −2  s −1  ), variable (by a factor of ∼2) and with a steep power‐law spectrum  (Γ= 2.7) . It coincides with a radio bright (∼200 mJy at 8.4 GHz) and flat spectrum object [MG4 J200112+4352 in NASA/IPAC Extragalactic Database (NED)]. Broad‐band optical photometry of this source suggests variability also in this waveband, while a spectroscopic follow‐up observation provides the first source classification as a BL Lac object. The source SED, as well as the overall characteristics and optical classification, point to a high frequency peaked blazar identification for 0FGL J2001.0+4352.

On the identification of the Fermi /LAT source 0FGL J2001.0+4352 with a BL Lac ★