  A comparison of the XMM-Newton and Chandra Galactic Centre (GC) Surveys has
revealed two faint X-ray transients with contrasting properties. The X-ray
spectrum of XMM J174544-2913.0 shows a strong iron line with an equivalent
width of ~2 keV, whereas that of XMM J174457-2850.3 is characterised by a very
hard continuum with photon index ~1.0. The X-ray flux of both sources varied by
more than 2 orders of magnitude over a period of months with a peak X-ray
luminosity of 5 x 10^34 erg/s. We discuss the nature of these peculiar sources.
