Is GlassFish v2 UR1 supported on AIX?

Yes. GlassFish v2 UR1 (download here) is the first version supported on AIX (AIX 5.3 64-bit OS and AIX 5.2 64-bit OS, on a 32-bit JVM). Only the Developer and Cluster profiles are supported.

Platforms supported in the GlassFish v2 UR1 release (which
corresponds to Sun's commercial counterpart, [Sun Java System Application Server 9.1
Update 1|http://www.sun.com/software/products/appsrvr/index.xml]) are listed in the release notes.

NOTE: For a good description of the differences between GlassFish and Sun's commercial Application Server, see How does GlassFish V2 differ from the Sun Java System Application Server 9.1?