.. _uncertainties: http://pythonhosted.org/uncertainties/
.. _scikit-image: http://scikit-image.org
.. _scikit-learn: http://scikit-learn.org/stable/
.. _scipy: https://docs.scipy.org/doc/scipy/reference/
.. _Scipy Lecture Notes: http://www.scipy-lectures.org/
.. _Practical Python for Astronomers Tutorial: http://python4astronomers.github.io/
.. _GammaLib: http://gammalib.sourceforge.net
.. _ctools: http://cta.irap.omp.eu/ctools
.. _3ML: https://threeml.stanford.edu/
.. _numpy: http://www.numpy.org/
.. _affiliated package: http://www.astropy.org/affiliated/index.html
.. _regions: https://astropy-regions.readthedocs.io
.. _reproject: https://reproject.readthedocs.io
.. _photutils: https://photutils.readthedocs.io
.. _astroplan: https://astroplan.readthedocs.io
.. _iminuit: https://github.com/iminuit/iminuit
.. _probfit: https://github.com/iminuit/probfit
.. _h5py: http://www.h5py.org/
.. _naima: https://github.com/zblz/naima
.. _ROOT: https://root.cern.ch/drupal/
.. _PyROOT: https://root.cern.ch/drupal/content/pyroot
.. _rootpy: http://www.rootpy.org/
.. _Sherpa: http://cxc.cfa.harvard.edu/sherpa/
.. _CIAO: http://cxc.cfa.harvard.edu/ciao/
.. _Chandra X-ray observatory (CXC): http://cxc.harvard.edu/
.. _aplpy: http://aplpy.github.io
.. _matplotlib: http://matplotlib.org
.. _pandas: http://pandas.pydata.org
.. _pip: https://pip.pypa.io/en/stable/
.. _pip install instructions: https://pip.pypa.io/en/latest/installing.html#install-pip
.. _conda: https://conda.io/docs/
.. _conda cheat sheet: https://docs.conda.io/projects/conda/en/latest/user-guide/cheatsheet.html
.. _PyFACT: https://ui.adsabs.harvard.edu/abs/2012AIPC.1505..789R
.. _healpy: https://healpy.readthedocs.io/en/latest/
.. _HEALPix: https://en.wikipedia.org/wiki/HEALPix
.. _PyYAML: https://pypi.org/project/PyYAML/
.. _YAML: https://en.wikipedia.org/wiki/YAML
.. _jsonschema: https://python-jsonschema.readthedocs.io
.. _json-schema.org: https://json-schema.org/
.. _emcee: http://dan.iel.fm/emcee/current/
.. _ctapipe: https://github.com/cta-observatory/ctapipe
.. _click: http://click.pocoo.org/
.. _sphinx-click: https://github.com/click-contrib/sphinx-click
.. _pycrflux: https://github.com/akira-okumura/pycrflux
.. _act-analysis: https://bitbucket.org/kosack/act-analysis
.. _VHEObserverTools: https://github.com/kialio/VHEObserverTools
.. _photon_simulator: http://yt-project.org/doc/analyzing/analysis_modules/photon_simulator.html
.. _PINT: https://github.com/nanograv/PINT
.. _Gamera: https://github.com/JoachimHahn/GAMERA
.. _gammatools: https://github.com/woodmd/gammatools
.. _FLaapLUC: https://github.com/jlenain/flaapluc
.. _pointlike: https://github.com/tburnett/Fermi-LAT
.. _NaN: https://en.wikipedia.org/wiki/NaN
.. _Python: https://www.python.org
.. _parfive: https://parfive.readthedocs.io
.. _corner: https://corner.readthedocs.io
.. _gammapy-0.13-environment.yml: https://gammapy.org/download/install/gammapy-0.13-environment.yml

.. _MPIK Heidelberg: https://www.mpi-hd.mpg.de/mpi/en/start/
.. _APC Paris: http://www.apc.univ-paris7.fr/
.. _Paris Observatory: https://www.obspm.fr

.. _Python for gamma-ray astronomy 2015: http://gammapy.github.io/PyGamma15/

.. _CTA: https://www.cta-observatory.org/
.. _H.E.S.S.: https://www.mpi-hd.mpg.de/hfm/HESS/
.. _HAWC: https://www.hawc-observatory.org/
.. _VERITAS: https://veritas.sao.arizona.edu/
.. _MAGIC: https://magic.mpp.mpg.de/
.. _Fermi-LAT: https://fermi.gsfc.nasa.gov/
.. _Fermi ScienceTools: https://fermi.gsfc.nasa.gov/ssc/data/analysis/software/
.. _FermiPy: https://github.com/fermiPy/fermipy
.. _gadf: https://gamma-astro-data-formats.readthedocs.io/

.. _April 2016 IACT data meeting: https://github.com/open-gamma-ray-astro/2016-04_IACT_DL3_Meeting/

.. _Werner Hofmann: https://en.wikipedia.org/wiki/Werner_Hofmann_(physicist)
.. _Jim Hinton: https://www.mpi-hd.mpg.de/mpi/en/hinton/home/
.. _Martin Raue: https://twitter.com/_rmrtn
.. _Christoph Deil: https://github.com/cdeil

.. _Google Summer of Code: https://summerofcode.withgoogle.com/
.. _Manuel Paz Arribas GSoC 2015 on observation handling and cube background modeling: http://mapaz-gsoc2015-blog.blogspot.de/
.. _Olga Vorokh GSoC 2016 on image analysis and source detection: http://alcyonegammapy.blogspot.de/
.. _Gammapy poster and proceeding at ICRC 2015: https://indico.cern.ch/event/344485/session/142/contribution/695
.. _First Gammapy coding sprint: https://github.com/gammapy/gammapy/wiki/PyGamma-coding-sprint-1
.. _Gammapy poster at Gamma 2016: https://github.com/gammapy/gamma2016-gammapy-poster/blob/master/gamma2016-gammapy-poster.pdf
.. _First Gammapy presentation at a CTA meeting: https://github.com/gammapy/gammapy-extra/blob/master/presentations/2016-05-16_CTA_Meeting_Gammapy.pdf
.. _Open TeV source catalog: https://github.com/gammapy/gamma-cat
.. _gamma-sky.net: http://gamma-sky.net/
.. _Gammapy binder: http://mybinder.org/repo/gammapy/gammapy-extra

.. _Gammapy mailing list: https://groups.google.com/forum/#!forum/gammapy
.. _Gammapy Github page: https://github.com/gammapy/gammapy
.. _gammapy-webpage: https://github.com/gammapy/gammapy-webpage
.. _Gammapy documentation: https://docs.gammapy.org/
.. _Gammapy contact: https://gammapy.org/contact.html
.. _Gammapy project summary on Open HUB: https://www.openhub.net/p/gammapy
.. _Gammapy page on PyPI: https://pypi.org/project/gammapy
.. _Gammapy contributors page on Github: https://github.com/gammapy/gammapy/graphs/contributors
.. _Gammapy on Slack: https://gammapy.slack.com

.. _Slack: https://slack.com
.. _PyPI: https://pypi.org

.. _scientific Python stack: https://www.scipy.org/about.html

.. _ctobssim: http://cta.irap.omp.eu/ctools-devel/reference_manual/ctobssim.html
.. _gtpsf: https://fermi.gsfc.nasa.gov/ssc/data/analysis/scitools/help/gtpsf.txt
.. _rsync: https://en.wikipedia.org/wiki/Rsync

.. _PHA: https://heasarc.gsfc.nasa.gov/docs/heasarc/ofwg/docs/spectra/ogip_92_007/node5.html
.. _ARF: https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/docs/memos/cal_gen_92_002/cal_gen_92_002.html#tth_sEc4
.. _RMF: https://heasarc.gsfc.nasa.gov/docs/heasarc/caldb/docs/memos/cal_gen_92_002/cal_gen_92_002.html#tth_sEc3.1

.. _Github clone URL help article: https://help.github.com/articles/which-remote-url-should-i-use/

.. _ipython: https://ipython.org
.. _Jupyter: https://jupyter.org
.. _JupyterLab: https://jupyterlab.readthedocs.io/
.. _nbsphinx: https://nbsphinx.readthedocs.io
.. _Installing Python Packages from a Jupyter Notebook: http://jakevdp.github.io/blog/2017/12/05/installing-python-packages-from-jupyter/

.. _apt-get: https://en.wikipedia.org/wiki/Advanced_Packaging_Tool
.. _yum: https://en.wikipedia.org/wiki/Yellowdog_Updater,_Modified
.. _Macports: https://www.macports.org/
.. _Homebrew: https://brew.sh/
.. _Fermi-LAT time systems in a nutshell: https://fermi.gsfc.nasa.gov/ssc/data/analysis/documentation/Cicerone/Cicerone_Data/Time_in_ScienceTools.html
.. _FTOOLS: https://heasarc.gsfc.nasa.gov/ftools/ftools_menu.html
.. _XSpec: https://heasarc.gsfc.nasa.gov/xanadu/xspec/
.. _XSpec manual statistics page: https://heasarc.nasa.gov/xanadu/xspec/manual/XSappendixStatistics.html
.. _Sherpa statistics page: https://cxc.cfa.harvard.edu/sherpa/statistics
.. _XML schema: https://en.wikipedia.org/wiki/XML_schema
.. _setuptools console_scripts entry point: https://python-packaging.readthedocs.io/en/latest/command-line-scripts.html
.. _pydantic: https://pydantic-docs.helpmanual.io

.. _A Whirlwind tour of Python: https://nbviewer.jupyter.org/github/jakevdp/WhirlwindTourOfPython/blob/master/Index.ipynb
.. _Python data science handbook: http://nbviewer.jupyter.org/github/jakevdp/PythonDataScienceHandbook/blob/master/notebooks/Index.ipynb
.. _Astropy Hands-On Tutorial: https://github.com/Asterics2020-Obelics/School2019/tree/master/astropy
