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Aims. We report the discovery of a peculiar object observed serendipitouslywith XMM-Newton. We present its timing and spectral properties and investigateits optical counterpart. Methods. The light curve of the X-ray source, itsspectrum, and the spectrum of the best optical counterpart are presented andanalyzed. Results. The X-ray flux decreases by a factor of 6.5 within 1 h andstays in a low state for at least 10 h, thereby suggesting the presence of aneclipse. The spectrum is very soft, a power law with a slope of Gamma~2.8, anddoes not change significantly before and after the flux drop. The source isspatially coincident within few arc-seconds with a Seyfert~2 galaxy belongingto a galaxy pair. Conclusions. Although the background AGN seems the bestcounterpart, neither the temporal nor the spectral properties of the X-raysource are compatible with it. We investigate the possibility of having aforeground low-mass X-ray binary in quiescence, where the companion is notdetected in the optical wavelength.

XMMU J134736.6+173403: an eclipsing LMXB in quiescence or a peculiar AGN?