  We present results of a Chandra survey of the ultra-luminous X-ray sources
(ULX) in 13 normal galaxies, in which we combine source detection with X-ray
flux measurement. 22 ULX were detected, i.e. with L_x > 1 x 10^{39} erg s^{-1}
(L_10), and 39 other sources were detected with L_x > 5 x 10^{38} erg s^{-1}
(L_5). We also use radial intensity profiles to remove extended sources from
the sample. The majority of sources are not extended, which for a typical
distance constrains the emission region size to less than 50 pc. X-ray
colour-colour diagrams and spectral fitting results were examined for
indicators of the ULX nature. In the case of the brighter sources, spectral
fitting generally requires two-component models. In only a few cases do
colour-colour diagrams or spectral fitting provide evidence of black hole
nature. We find no evidence of a correlation with stellar mass, however there
is a strong correlation with star formation as indicated by the 60 micron flux
as found in previous studies.
