3C445 was observed with the ROSAT PSPC in 1993 May for 11,344
sec. Since the angular resolution of the PSPC is better than ASCA we
examined the ROSAT image looking for contaminating sources nearby the
radio galaxy. 3C445 was detected with a count rate 0.016 
0.001
counts s 
, at a position off-axis by 
6 arcmin. The radial
profile of the source was extracted in the energy range 0.25-2.0 keV
out to 3 arcmin from the centroid of 3C445; the model profile was
energy- and position-weighted. A significant excess of counts is
present in the observed profile at 1.2 arcmin. The ROSAT coordinates
of this serendipitous source (from the aspect solution and optical
astrometry) are RA(2000)=22 23 44.7, DEC(2000)= -02 06 38.2, with
uncertainties 5 arcsec; no optical counterpart was found in the
databases NED and SIMBAD. Its PSPC count rate is (4.2
1.2) 
cts s (from the algorithm
SOSTA in XIMAGE), a factor 
4 fainter than
3C445. When the serendipitous source is excluded from the analysis the
radial profile of 3C445 is consistent with a point-like source. There
is a weak ( 
) evidence for some residual excess flux
around 1 arcmin, which, however, is not significant. To date, 3C445
has not been imaged with the ROSAT HRI.
We checked for possible contamination in the ASCA data by the
serendipitous ROSAT source by accumulating an SIS image in the range
of overlap with the PSPC, 0.5-2.4 keV. A faint source is present at a
position consistent with the ROSAT coordinates, with a count rate (1.6
0.9) counts s in SIS0, roughly similar
to the ROSAT flux and a factor 30 lower than 3C445. Thus it is
unlikely that the serendipitous source will contaminates significantly
the ASCA spectrum of 3C445. The contaminating ROSAT source is not
present in the GIS images. Since the GIS sensitivity peaks at higher
energies than the SIS, this result suggests a steep X-ray spectrum for
the serendipitous source.