VACUUM VERBOSE output to STDERR

Hello,

I'm trying to solve a little issue: I wish to redirect my cron
jobs'output to log files. STDOUT redirection is done inside the crontab,
but VACUUM still yields its messages[1] through, onto STDERR, I guess.
I wouldn't like to '2>&1' also: I wish I could keep STDERR (what if an
error condition must be reported ?).
Is there a way to do so ?

Thanks in advance,

BR,
Francis

[1]e.g.:
<snip>
NOTICE: --Relation pg_type--
NOTICE: Pages 3: Changed 0, Empty 0; Tup 145: Vac 0, Keep 0, UnUsed 2.
Total CPU 0.00s/0.00u sec elapsed 0.07 sec.
NOTICE: Analyzing pg_type
NOTICE: --Relation pg_attribute--
NOTICE: Pages 12: Changed 0, Empty 0; Tup 827: Vac 0, Keep 0, UnUsed
32. Total CPU 0.00s/0.00u sec elapsed 0.00 sec.
NOTICE: Analyzing pg_attribute
</snip>