Data obtained with the H.E.S.S. telescopes are recorded and stored in “root” format, which is widely used in the particle physics community. From the early phases the collaboration developed several proprietary analysis methods. Processed data are stored in proprietary file structures. In order to facilitate exchange and common treatment of data obtained with other facilities and to allow efficient adaptation of open-source software, the H.E.S.S. collaboration explored data analysis with different open-source tools using the open FITS data format for some time.

Based on extensive tests and development and adaptation, the collaboration now chose Gammapy as its open-source analysis framework. Gammapy v1.0rc Gammapy will be released in the next weeks.

Gammapy-based studies will complement the well-established proprietary analysis methods used by the H.E.S.S. collaboration and facilitate further development of the tools by challenges posed in exploring real observations obtained with H.E.S.S..