  We report here on the XMM-Newton observations of the three supergiant fast
X-ray transients (SFXT) XTE J1739-302, IGRJ08408-4503, and IGRJ18410-0535. For
the latter source we only discuss some preliminary results of our data
analysis. Some interpretation is provided for the timing and spectral behavior
of the three sources in terms of the different theoretical models proposed so
far to interpret the behavior of the SFXTs.
