# COMPTEL Reloaded: a heritage project in MeV astronomy

## TL;DR

This paper discusses the COMPTEL instrument on NASA's CGRO, emphasizing its unique MeV gamma-ray survey data, ongoing analysis, and the importance of heritage data for future MeV astronomy research.

## Contribution

It highlights the continued analysis of COMPTEL data, leveraging improved techniques and computing power to extract valuable scientific insights from the heritage dataset.

## Key findings

- COMPTEL provided unique full-sky MeV gamma-ray survey data.
- Ongoing data analysis enhances scientific understanding of MeV gamma-ray sources.
- Heritage data remains crucial for future MeV astronomy missions.

## Abstract

COMPTEL was the Compton telescope on NASA's Compton Gamma Ray Observatory CGRO launched in April 1991 and which was re-entered in June 2000. COMPTEL covered the energy range 0.75 to 30 MeV, and performed a full-sky survey which is still unique in this range, with no followup mission yet approved. This remains a major uncharted region, and the heritage data from COMPTEL are still our main source of information. Data analysis has continued at MPE however, since the data were never fully analysed during the mission or in the period following, and improvements in analysis techniques and computer power make this possible.