These are the webpages relative to the CIAO 3.4 release
(18 December 2006). They are no longer actively updated,
however the CXC will continue limited support of CIAO 3.4
for the near future.
CIAO 3.4 users should check
the CALDB 3 website for
compatible calibration updates.
15 Dec 2008
The newest version of the Chandra Interactive Analysis of
Observations software, is CIAO
4.1, released on 15 December 2008. Read the
release notes
for detailed information. This release requires that
CALDB 4.1.0 be installed
for the software to work correctly.
When Chandra data goes through Standard
Data Processing (SDP), the most recently
available calibration is applied to it. Since this
calibration is continuously being improved, one should check
whether there are currently newer files available. Similarly,
some science decisions are made during SDP; every user has the
option to reprocess the data with different parameters.
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