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More than 20 years after the end of NASA's Compton Gamma-Ray Observatorymission, the data collected by its Imaging Compton Telescope (COMPTEL) stillprovide the most comprehensive and deepest view of our Universe in MeV gammarays. While most of the COMPTEL data are archived at NASA's High EnergyAstrophysics Science Archive Research Center (HEASARC), the absence of anypublicly available software for their analysis means the data cannot benefitfrom the scientific advances made in the field of gamma-ray astronomy at higherenergies. To make this unique treasure again accessible for science, wedeveloped open source software that enables a comprehensive and modern analysisof the archived COMPTEL telescope data. Our software is based on a dedicatedplug-in to the GammaLib library, a community-developed toolbox for the analysisof astronomical gamma-ray data. We implemented high-level scripts for buildingscience analysis workflows in ctools, a community-developed gamma-ray astronomyscience analysis software framework. We describe the implementation of oursoftware and provide the underlying algorithms. Using data from the HEASARCarchive, we demonstrate that our software reproduces derived data products thatwere obtained in the past using the proprietary COMPTEL software. Wefurthermore demonstrate that our software reproduces COMPTEL science resultspublished in the literature. This brings the COMPTEL telescope data back intolife, allowing them to benefit from recent advances in gamma-ray astronomy, andgives the community a means to unveil its still hidden treasures.

COMPTEL data analysis using GammaLib and ctools