  We report preliminary results of a broadband spectral and temporal study of
the black-hole binary Cyg X-1 performed with the IBIS telescope. Cyg X-1 was
the first pointed celestial target of IBIS during the INTEGRAL Performance and
Verification Phase, 2002 Nov.-Dec., for a total observing time of 2 Ms in both
staring and dithering mode. Here, we report on only the staring, on-axis,
observation performed in a stable instrument configuration. During the
observing period the source was in its characteristic low/hard state, in which
a few flares and dips have been detected. The IBIS/ISGRI results demonstrate
that the INTEGRAL observatory offers a unique capability for studying
correlations between hardness and/or flux in different bands over a wide photon
energy range. One of our new results is finding that the hardness-flux
correlation changes the sign twice over the 20-220 keV; first from positive to
negative at 50 keV, and then back to positive at 120 keV. The former change
appears to be due to the spectral curvature introduced by variable Compton
reflection. The latter may be due spectral pivoting.
