stderr redirection in csh script

Man pages....look at the man pages. If you don't have them, you can find them on-line. Read them when you have nothing better to do. Find new commands and new ways of doing things.

The answer:
The only way to direct the standard output and standard
error separately is by invoking a subshell, as follows:

      example% \(command > outfile\) >& errorfile

 Although robust enough for general use, adventures into  the
 esoteric  periphery  of  the  C  shell may reveal unexpected
 quirks.