Source Model Bugs: beta2d

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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.

Bugs

When the xpos and ypos parameters are set, a "Warning: Parameter b2.xpos is out of range." is printed, even if the values are within the limits.

This occurs even when automatic estimation of the initial values is used:

sherpa> beta2d
Warning: Parameter beta2d.xpos is out of range.
Warning: Parameter beta2d.ypos is out of range.
sherpa> show beta2d
beta2d[beta2d] (integrate: off)
    Param Type Value Min Max Units
    ----- ---- ----- --- --- -----
 1 r0 thawed 351 3.51e-02 702
 2 xpos thawed 0 0 351.5
 3 ypos thawed 0 0 351.5
 4 ellip frozen 0 0 0.999
 5 theta frozen 0 0 6.2832
 6 ampl thawed 44 0.44 4400
 7 alpha thawed 1 -10 10

The analysis results are unaffected by this bug.