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Last modified: 4 December 2007

URL: http://cxc.harvard.edu/ciao4.0/releasenotes/ciao_3.2.1_release.html

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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.

News

Previous Items

15 Sep 2008 [New]

The Chandra Contributed Software page has been updated to include a variety of analysis packages and tools which are widely used in the community.

Other Software for Chandra Data Analysis (Note that this is a new URL as well.)

Contributions to the page should be submitted through the Helpdesk.

8 Sep 2008 [New]

CALDB 3.5.0 has been released for use with CIAO 3.4 and CIAO 4.0.

Information on the patch is available from the CALDB 3.5.0 Release Notes and How CALDB 3.5.0 Affects Your Analysis.

Download CALDB 3.5.0

23 Jun 2008

CALDB 3.4.5 has been released for use with CIAO 3.4 and CIAO 4.0.

Information on the patch is available from the CALDB 3.4.5 Release Notes and How CALDB 3.4.5 Affects Your Analysis.

Download CALDB 3.4.5

CIAO 3.2.1 Release Notes

Return to: Version History

The CIAO 3.2.1 patch contains updated versions of acis_build_badpix and acis_run_hotpix. For more information on using these tools, please see the Identify ACIS Hot Pixels and Cosmic Ray Afterglows thread, which has been updated to reflect the changes in this release.

  • acis_build_badpix is updated to write a correct header in the output bad pixel file.

  • acis_run_hotpix is updated to accept a parameter block file (pbkfile parameter). The ahelp file for the tool has been updated.

Make sure to delete any existing parameter file (acis_run_hotpix.par) in ~/cxcds_param so that you pick up the CIAO 3.2.1 default version, which has a new parameter (pbkfile).

If you created a new bad pixel file with acis_run_hotpix in CIAO 3.2 and the tool did not report any errors, it is not necessary to recreate the file in CIAO 3.2.1.

Last modified: 4 December 2007

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