Chandra X-Ray Observatory
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Last modified: 11 April 2018


Chandra Interactive Analysis of Observations

from "s'sciavo", "I am your servant" in Venetian dialect*


Install CIAO 4.10
& CALDB 4.7.8

Read the CIAO 4.10 release notes for detailed information on this release, including How CALDB 4.7.8 Affects Your Analysis.

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I need help!

For anyone having trouble using CIAO or analysing Chandra data.

CIAO Software Help Pages

Frequently Asked Questions (FAQ)

Known CIAO Bugs and Tool Caveats

CXC Helpdesk

What has changed?

What has changed in the site recently? Has there been a new release of CIAO, the contributed scripts, or the CALDB?

What's New

"Watch Out" List

Version History

CIAO Release Notes

CALDB Release Notes

I need more!

For the expert CIAO user or person who needs more detailed information.

Why Topics


Scripting in CIAO

Citing CIAO

If you are writing a paper and would like to cite the CIAO software, we recommend the following:

CIAO: Chandra's data analysis system (ADS, PS)
Fruscione et al. 2006, SPIE Proc. 6270, 62701V, D.R. Silvia & R.E. Doxsey, eds.

\bibitem[Fruscione et al.(2006)]{2006SPIE.6270E..60F} Fruscione, A., et al.\ 2006, \procspie, 6270

The specific version of CIAO and CALDB used for the analysis should be mentioned.

Further guidelines are available from the Acknowledgment of Use of Chandra Resources.

Last modified: 11 April 2018
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The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email: Smithsonian Institution, Copyright © 1998-2017. All rights reserved.