  This paper presents new X-ray observations of Mrk 231, an active galaxy of
particular interest due to its large infrared luminosity and the presence of
several blueshifted broad absorption line (BAL) systems, a phenomenon observed
in a small fraction of QSOs.
  A ROSAT HRI image of Mrk 231 is presented, this shows an extended region of
soft X-ray emission, covering several tens of kpc, consistent with the extent
of the host galaxy. An ASCA observation of Mrk 231 is also presented. Hard
X-rays are detected but the data show no significant variability in X-ray flux.
The hard X-ray continuum is heavily attenuated and X-ray column estimates range
from ~ 2 x 10^{22} - 10^{23} cm^{-2} depending on whether the material is
assumed to be neutral or ionized, and on the model assumed for the extended
X-ray component. These ASCA data provide only the second hard X-ray spectrum of
a BAL AGN presented to date. The broad-band spectral-energy-distribution of the
source is discussed. While Mrk 231 is X-ray weak compared to Seyfert 1
galaxies, it has an optical-to-X-ray spectrum typical of a QSO.
