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07 Nov 2006 CALDB version 3.2.4 has been released. This release contains ACIS time-dependent gain calibration files only. See the How CALDB 3.2.4 Affects Your Analysis section of the CIAO release notes and the CALDB release notes for details. 15 May 2006 CALDB version 3.2.2 has been released. See the How CALDB 3.2.2 Affects Your Analysis section of the CIAO release notes and the CALDB release notes for details. 3 Apr 2006 Reprocessing III Reprocessing III, a complete reprocessing of all observations in the Chandra Data Archive, began in February 2006. The quality of the reprocessed data will be improved over the current data in the archive due to updates in software and calibration. The Reprocessing III of Chandra Data webpage has details on the reprocessing schedule and the specific software and calibration changes that are included. 3 Mar 2006 Update: Removal of support for QPOE files in CIAO The CXC will end the support of PROS-style QPOE files as of the CIAO 4 release. These files are currently only supported in the Solaris version of CIAO. |
Sherpa Threads for CIAOWhen running a thread for the first time, you may wish to follow along, using the actual data employed in the thread. Please see the Getting Started thread for instructions on how to download and use the example data. All threadsA list of all the threads on one page. IntroductoryThese threads explain the basics of Sherpa: reading data, establishing models, fitting, and plotting. Information on how to customize plots via the Sherpa state objects (a.k.a. configuration variables) is covered as well. FittingSherpa provides extensive facilities for modeling and fitting data. The topics here range from basic fits using source spectra and responses to more advanced areas such as simultaneous fits to multiple datasets, accounting for the effects of pileup, and fitting spatial and grating data. PlottingSherpa allows the user to plot data, fits, statistics, ARFs, contours, surfaces, and more. These threads describe the basics of plotting as well as various methods for customizing plots. StatisticsSherpa provides numerous tools for determining goodness of fit, errors in parameter values, confidence intervals, and other statistical measures of a model's validity. These threads describe how to use these tools in your analysis. S-LangThe S-Lang language and Sherpa/S-Lang module provide a powerful means of extending Sherpa's capabilities through custom-made functions and scripts. The threads here introduce Sherpa's S-Lang functionality and provide some examples of its use. MiscellaneousThese threads describe other tasks that one can perform using Sherpa. DatasetsLinks to the datasets used in the threads. |
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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: cxcweb@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2004. All rights reserved. |