We report on the X-ray spectral properties of 10 short bursts from SGR 1900+14 observed with the Narrow Field Instruments onboard BeppoSAX in the hours following the intermediate flare of 2001 April 18 .
Burst durations are typically shorter than 1 s , and often show significant temporal structure on time scales as short as \sim 10 ms .
Burst spectra from the MECS and PDS instruments were fit across an energy range from 1.5 to above 100 keV .
We fit several spectral models and assumed N _ { H } values smaller than 5 \times 10 ^ { 22 } cm ^ { -2 } , as derived from observations in the persistent emission .
Our results show that the widely used optically thin thermal bremsstrahlung law provides acceptable spectral fits for energies higher than 15 keV , but severely overestimated the flux at lower energies .
Similar behavior had been observed several years ago in short bursts from SGR 1806-20 , suggesting that the rollover of the spectrum at low energies is a universal property of this class of sources .
Alternative spectral models - such as two blackbodies or a cut-off power law - provide significantly better fits to the broad band spectral data , and show that all the ten bursts have spectra consistent with the same spectral shape .