  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.
