%0 Journal Article %A Carpano, S. %A Nucita, A. %A Altieri, B. %A King, A. R. %A Leisy, P. %D 2012 %T XMMU J134736.6+173403: An eclipsing LMXB in quiescence or a peculiar AGN? %U https://figshare.le.ac.uk/articles/journal_contribution/XMMU_J134736_6_173403_An_eclipsing_LMXB_in_quiescence_or_a_peculiar_AGN_/10119443 %2 https://figshare.le.ac.uk/ndownloader/files/18236393 %K IR content %X Aims.We report the discovery of a peculiar object observed serendipitously with XMM-Newton. We present its timing and spectral properties and investigate its optical counterpart. Methods.The light curve of the X-ray source, its spectrum, and the spectrum of the best optical counterpart are presented and analyzed. Results.The X-ray flux decreases by a factor of 6.5 within 1 h and stays in a low state for at least 10 h, thereby suggesting the presence of an eclipse. The spectrum is very soft, a power law with a slope of $\Gamma\sim2.8$, and does not change significantly before and after the flux drop. The source is spatially coincident within few arc-seconds with a Seyfert 2 galaxy belonging to a galaxy pair. Conclusions.Although the background AGN seems the best counterpart, neither the temporal nor the spectral properties of the X-ray source are compatible with it. We investigate the possibility of having a foreground low-mass X-ray binary in quiescence, where the companion is not detected in the optical wavelength. %I University of Leicester