We use WIRC , IR images of the Antennae ( NGC 4038/4039 ) together with the extensive catalogue of 120 X-ray point sources ( 23 ) to search for counterpart candidates .
Using our proven frame-tie technique , we find 38 X-ray sources with IR counterparts , almost doubling the number of IR counterparts to X-ray sources first identified in Clark et al .
( 6 ) .
In our photometric analysis , we consider the 35 IR counterparts that are confirmed star clusters .
We show that the clusters with X-ray sources tend to be brighter , K _ { s } \approx 16 mag , with ( J - K _ { s } ) = 1.1 mag .

We then use archival HST images of the Antennae to search for optical counterparts to the X-ray point sources .
We employ our previous IR-to-X-ray frame-tie as an intermediary to establish a precise optical-to-X-ray frame-tie with < 0.6 arcsec rms positional uncertainty .
Due to the high optical source density near the X-ray sources , we determine that we can not reliably identify counterparts .
Comparing the HST positions to the 35 identified IR star cluster counterparts , we find optical matches for 27 of these sources .
Using Bruzual-Charlot spectral evolutionary models , we find that most clusters associated with an X-ray source are massive , \sim 10 ^ { 6 } M _ { \sun } , young , \sim 10 ^ { 6 } yr , with moderate metallicities , Z = 0.05 .