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11 Nov 2008

These are the webpages relative to Sherpa in the CIAO 3.4 release (18 December 2006). They are no longer actively updated, however the CXC will continue limited support of CIAO 3.4 for the near future.

15 Dec 2008

The newest version of the Chandra Interactive Analysis of Observations software, is CIAO 4.1, released on 15 December 2008. Read the release notes for detailed information. This release requires that CALDB 4.1.0 be installed for the software to work correctly.

Fitting

WHAT'S NEW | WATCH OUT

| Top | All | Introductory | Fitting | Plotting | Statistics | S-Lang | Miscellaneous | Datasets || CIAO | ChaRT | Proposal |

Sherpa 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.

Spectral (1-D) Data
- Introduction to Fitting PHA Spectra
- Changing the grouping scheme of a dataset within Sherpa
  Uses: the sherpa_utils.sl S-Lang script
- Introduction to Fitting ASCII Data with Errors: Single-Component Source Models
- Fitting PHA Data with Multi-Component Source Models
- Independent Background Responses
- Simultaneously Fitting Two Datasets
- Simulating 1-D Data: the Sherpa FAKEIT Command
- Simulating 1-D Data: the S-lang Script simspec
  Uses: the simspec script
- Simulation for Suzaku: Evaluate HXD systematic errors
- Using A Pileup Model
- See also: a comparison, for low pileup fractions, of the pileup models in Sherpa and XSpec with that in ISIS.
Spatial (2-D) Data
- Fitting FITS Image Data
  Uses: the sherpa_plotfns.sl S-Lang script
- Using an Exposure Map in Fitting Image Data
- Using a PSF Image as the Convolution Kernel
- See also: the Obtain and Fit a Radial Profile thread
Grating Data

Hardcopy (PDF): A4 | Letter

Last modified: 11 December 2007

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Fitting

Spectral (1-D) Data

Spatial (2-D) Data

Grating Data