[AstroPy] ANN: Sherpa v4.8.0 released

[Doug Burke]

[It wasn't clear from the docs whether announcements like this are
supported on the email list; apologies if not]

Dear colleagues,

We are very happy to announce the v4.8.0 release of Sherpa, a Python-based
fitting and modelling system that has strong support for Astronomy data (in
particular, X-ray data). Thanks to Zenodo and GitHub its DOI is
http://dx.doi.org/10.5281/zenodo.45243

Sherpa has recently been moved to an open-development model - with
development at https://github.com/sherpa/sherpa/ - and this release is
provided to match the functionality in the CIAO 4.8.0 release.

Release notes are available at
https://github.com/sherpa/sherpa/releases/tag/4.8.0 and include improved
functionality (e.g. the addition of the "wstat" statistic introduced by
XSPEC for incorporating a background when using Poisson statistics and
improvements to the interface to the XSPEC user models) as well as
improvements to the build and organisation of the module (e.g. improved
docstrings).

We provide Linux and OS-X packages for users of the Anaconda Python
Distribution,

$ conda config --add channels https://conda.binstar.org/sherpa
$ conda install sherpa

Or source code can be downloaded from https://github.com/sherpa/sherpa/tags

One known issue with this release (which is fixed in the master branch) is
that it can not be used with version 1.5 of matplotlib. It is, as far as we
know, compatible with recent releases of AstroPy!

Further information can be found at http://cxc.harvard.edu/contrib/sherpa/ and
we look forward to any input you have. Please feel free to forward this
announcement to anyone who you feel would be interested in this release.

For the Sherpa core development team,
Doug Burke
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