LEGRI was proposed in response to the Spanish Instituto Nacional
de Technicas Aerospaciales (INTA) 1993 call for proposals for
the first MINISAT mission (MSAT1). The aim of the proposed
mission is the demonstration of the technological feasibility of
the construction of new generation gamma-ray telescopes,
optimized for low energy (10-100 keV) astronomy, using 80 HgI2
detectors and 20 CZT pixels, The Group was involved in
developing the detectors. This material provides an excellent
response in the 10-100 keV range, with the best presently
achieved efficiency/volume ratio. The 10-100 keV region contains
unique, not fully explored, astrophysical information regarding
nuclear excitation processes, radioactivity, cyclotron emission
and absorption processes. LEGRI was successfully launched on
April 21st, 1997, on a Pegasus XL rocket. The instrument was
activated on May 19, 1997. The technical evaluation as well as
the scientific analysis is ongoing. One of the technical mission
goals is the measurement of the par