Other package managers

Besides conda, Gammapy and some of the optional dependencies (Sherpa, Astropy-affiliated packages) are not yet available in other package managers, such as e.g. apt-get or yum on Linux or Macports or Homebrew on Mac.

So installing Gammapy this way is not recommended at this time. (The recommended method is conda as mentioned above).

Still, it’s possible and common on systems where users have root access to install some of the dependencies using those package managers, and then to use pip to do the rest of the installation.

So as a convenience, here we show the commands to install those packages that are available, so that you don’t have to look up the package names.

We do hope this situation will improve in the future as more astronomy packages become available in those distributions and versions are updated.


On Ubuntu or Debian Linux, you can use apt-get and pip to install Gammapy and it’s dependencies.

The following packages are available:

sudo apt-get install \
    python3-pip python3-scipy python3-matplotlib python3-skimage \
    python3-yaml ipython3-notebook python3-uncertainties \
    python3-astropy python3-click

The following packages have to be installed with pip:

python3 -m pip install --user \
    gammapy naima reproject \
    iminuit emcee healpy sherpa

Another option to install software on Debian (and any system) is to use conda.


yum is a popular package manager on Linux, e.g. on Scientific linux or Red Hat Linux.

If you are a yum user, please contribute the equivalent commands.


Homebrew is a popular package manager on Mac.

Gammapy currently isn’t packaged with Homebrew. It should be possible to install Python / pip / Numpy / Astropy with brew and then to install Gammapy with pip.

If you’re a brew user, please let us know if it works and what the exact commands are.

Fermi ScienceTools

The Fermi ScienceTools ships with it’s own Python 2.7 interpreter.

The last release of Gammapy to support Python 2.7 was Gammapy v0.10 from January 2019. pip should know about this and automatically install Gammapy v0.10, and not try to install a later version of Gammapy.

If you want to use Astropy or Gammapy with that Python, you have to install it using that Python interpreter, other existing Python interpreters or installed packages can’t be used (when they have C extensions, like Astropy does).

Fermi ScienceTools version v10r0p5 (released Jun 24, 2015) includes Python 2.7.8, Numpy 1.9.1, Scipy 0.14.0, matplotlib 1.1.1, PyFITS 3.1.2. Unfortunately pip, ipython or Astropy are not included.

So first in stall pip (see pip install instructions), and then

$ python -m pip install ipython astropy gammapy

If this doesn’t work (which is not uncommon, this is known to fail to compile the C extensions of Astropy on some platforms), ask your Python-installation-savvy co-worker or on the Astropy or Gammapy mailing list.