FATAL 1

I found a couple of entries
in my dmesg which stated
that linux (kernel 2.4) killed
two postmasters because the system
ran out of memory.

I think that postmaster should
log such instances as FATAL 1. I am
trying to recover the approximate
date and time these FATAL 1 entries are made
so that I can figure out what went
wrong.  But the postgres log file I have
don't have time stamps.

Does anyone know how I can recover
these time stamps?  If not is there a log
level for which time stamps will be made?

Thanks