longer ACIS-stowed background files available

From: Maxim Markevitch (maxim@head-cfa.cfa.harvard.edu)
Date: Thu Aug 21 2003 - 02:33:53 EDT

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Dear ACIS background users,

I've combined two ACIS-stowed background observations done
in Sep 2002 and May 2003 into a 100 ks dataset (which
includes only the detector background, no sky component).
The files can be found in
http://cxc.harvard.edu/contrib/maxim/acisbg/ (there are CIAO
and PSU versions of the CTI correction). See the
accompanying README and COOKBOOK.

Spectra from the Sep 2002 and May 2003 pieces are compared
at http://cxc.harvard.edu/contrib/maxim/stowed/; they are
almost identical.

One of the new data-processing things is the correction of
the gain time dependence. While this correction is on its
way into CIAO, use A. Vikhlinin's corr_tgain tool
(http://cxc.harvard.edu/contrib/alexey/tgain/) on your data.

Enjoy
Maxim Markevitch

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