Gammapy is an open-source Python package for gamma-ray astronomy built on Numpy, Scipy and Astropy.
It is a prototype for the science tools of the Cherenkov Telescope Array (CTA) and is already widely used in the analysis of existing gamma-ray instruments, such as H.E.S.S., MAGIC, VERITAS and HAWC.

Please remember to acknowledge and cite the use of gammapy!