  The great collecting area of the mirrors coupled with the high quantum
efficiency of the EPIC detectors have made XMM-Newton the most sensitive X-ray
observatory flown to date. This is particularly evident during slew exposures
which, while giving only 15 seconds of on-source time, actually constitute a
2-10 keV survey ten times deeper than current "all-sky" catalogues. Here we
report on progress towards making a catalogue of slew detections constructed
from the full, 0.2-12 keV energy band and discuss the challenges associated
with processing the slew data. The fast (90 degrees per hour) slew speed
results in images which are smeared, by different amounts depending on the
readout mode, effectively changing the form of the point spread function. The
extremely low background in slew images changes the optimum source searching
criteria such that searching a single image using the full energy band is seen
to be more sensitive than splitting the data into discrete energy bands. False
detections due to optical loading by bright stars, the wings of the PSF in very
bright sources and single-frame detector flashes are considered and techniques
for identifying and removing these spurious sources from the final catalogue
are outlined. Finally, the attitude reconstruction of the satellite during the
slewing manoeuver is complex. We discuss the implications of this on the
positional accuracy of the catalogue.
