Bugs: asphist

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CIAO 3.4 Homepage
CIAO 4.0 Homepage
Introduction: Welcome; Tools & Applications
Data Analysis: Analysis Guides; Science Threads; ChIPS Threads; Sherpa Threads; ChaRT Threads; Why Topics; Help Pages (AHELP)
Documentation: "Watch Out" List; Bug List; Frequently Asked Questions (FAQ); Manuals & Memos; Dictionary; Chandra Publications
Download CIAO: Download CIAO 4.0; System Requirements; Installation Instructions; Platform Support; Release Notes; Version History; Analysis Scripts; Other Analysis Software; CIAO Website
Sherpa (Modeling and Fitting): Sherpa website; Threads; Help Files
ChIPS (Plotting Package): ChIPS website; Threads; Help Files
S-Lang in CIAO: Introduction; Scripts and Packages; Modules
Data Products: Data Basics; Data Products Guide; Data Caveats; Standard Data Processing; Reprocessing III; Chandra Data Archive
Workshops and Conferences: Oct 2008 Workshop; Program Information; Previous Workshops; AAS HEAD 2008
CXC Links: CALDB; ChaRT; ObsVis; ATOMDB; WebGUIDE; Astrostatistics Collaboration; CXO Cross-calibration Page
Site Map

Analysis Notes

Matching CIAO and CALDB Versions

CIAO 4.0 requires CALDB 3.4.0 or higher to operate properly.

Are your versions mismatched? Time to update CIAO and CALDB!

Source Detection and Cosmic-Ray Afterglows

CIAO users who are trying to detect sources of about 10 counts or less should be aware of potential confusion with cosmic-ray afterglows that have not been removed from the data.

The Cosmic-Ray Afterglows why topic explains the limitations of the current tools and describes analysis tips to help eliminate more of the afterglows.