  We report on spectral and temporal results of the 40-700 keV observations,
obtained with the Gamma-Ray Burst Monitor (GRBM) on board BeppoSAX, of the two
large flares from the Soft Gamma-ray Repeater SGR1900+14 occurred on August 27,
1998 and April 18, 2001. From their intensity, fluence and duration, the first
one was classified as "giant" and the second as "intermediate". The spectral
results have been obtained with an improved response function of the GRBM. We
find that the two events have similar spectral properties, but different
temporal properties. The major difference concerns the time profiles of the
light curves, whereas the lack of evidence in the 2001 flare for the erratic
time variability found at high frequencies (10-1000 Hz) in the 1998 flare could
be ascribed to lower counting statistics. We discuss these results in the light
of the magnetar model proposed for SGR sources.
