From: "Townsend L.J." <firstname.lastname@example.org>
To: "email@example.com" <firstname.lastname@example.org>
Date: Wed, 5 Oct 2011 17:23:50 +0100
Subject: PN short observation and pile-up
I am trying to work out the best observing strategy for a source, but do not
fully understand the pile-up effects for bright sources. Is it true that the
shortest observation that can be made with XMM is 5ks and if so, why is this?
Initially the source will have a count rate in PN medium of ~30cts/s, which in
5ks is many more counts than I need, so am I unable to do a 1ks observation?
Secondly, pile up at this rate is, I'm sure, quite a problem. Can this be worked
around or should I be looking to perform such an observation in small window or
timing mode? To this end, is it possible with a sequence of observations, to
begin in small window mode and change to large window/full frame when the source
is much fainter?