Sakano, MWarwick, RSDecourchelle, AWang, QD2024-04-262024-04-262004-01-01https://hdl.handle.net/20.500.14394/2719<p>This is the pre-published version harvested from ArXiv.</p>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.Astrophysics and Astronomyarticle