  INTEGRAL and RXTE performed three simultaneous observations of the nearby
radio galaxy Cen A in 2003 March, 2004 January, and 2004 February with the
goals of investigating the geometry and emission processes via the
spectral/temporal variability of the X-ray/low energy gamma ray flux, and
intercalibration of the INTEGRAL instruments with respect to those on RXTE.
When combined with earlier archival RXTE results, we find the power law
continuum flux and the line-of-sight column depth varied independently, and the
iron line flux was essentially unchanging. Taking X-ray spectral measurements
from satellite missions since 1970 into account, we discover a variability in
the column depth between 1.0x10^23 cm^-2 and 1.5x10^23 cm^-2, and suggest that
variations in the edge of a warped accretion disk viewed nearly edge-on might
be the cause.
