GBS-discovered quiescent X-ray binaries: XMM eclipse duration and VLT spectra

We propose to use XMM to observe eclipsing probable quiescent lowmass Xraybinaries selected from the Galactic Bulge Survey. The XMM data are crucial todetermine the eclipsing duration, one cannot do this as accurately from opticallight curves as from Xray light curves as the Xray emission region is smallcompared to the mass donor star. Using the XMM eclipse duration and the VLTspectroscopy we can determine virtually model independent masses of the compactobjects. Furthermore, we may select different mass ratio systems favoringlowmass black holes. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]