  In X-ray binaries much of the optical/UV emission arises from X-rays
reprocessed by material in the accretion disk, stream and the companion star.
The resulting reprocessed variability will be delayed in time with respect to
the X-ray variability by an amount depending on the position of the
reprocessing regions. We can determine a range of time-delays present in the
system. This time-delay transfer function can be used to `echo-map' the
geometry of the reprocessing regions in the binary system.
  We present our modeling of this transfer function and show results from our
echo-mapping campaign using X-ray lightcurves from RXTE, simultaneous with HST.
In the X-ray transient, GRO j1655-40, shortly after the 1996 outburst, we find
evidence for reprocessing in the outer regions of a thick accretion disk.
