CIAO: X-ray Data Analysis Software

Quick CIAO links:	Download CIAO \| Science Threads \| Help Files \| Scripts
Related CXC sites:	ChIPS \| Sherpa \| PSFs with ChaRT \| CALDB
Related CXC sites:	Chandra Source Catalog \| TGCat: Chandra Gratings Catalog

Read the CIAO 4.5 release notes for detailed information on this release, including How CALDB 4.5.6 Affects Your Analysis.

I've never used CIAO before. Where should I begin?: Welcome to CIAO
Introduction to the Tools & Applications; Download CIAO 4.5
Installing CIAO 4.5 thread; Introductory Science Threads; Analysis Guides
Has a new version of CIAO or CALDB been released? What has changed in the site recently?: What's New; "Watch Out" List; Version History; CIAO Release Notes
CALDB Release Notes
CIAO isn't working correctly - I need help!: CIAO Software Help Pages; Frequently Asked Questions (FAQ); Known CIAO Bugs and Tool Caveats; CXC Helpdesk
I am an expert CIAO user. Where can I find more detailed information?: Why Topics; Manuals; Scripting in 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.