  X-ray flashes (XRFs) are a new type of fast transient source observed with
the BeppoSAX Wide Field Cameras (WFC) at a rate of about four per year. Apart
from their large fraction of 2-26 keV X-rays, the bulk properties of these
events are similar to those of classical gamma-ray bursts (GRBs). By
investigating the wide-band spectra of ten events detected in common with WFC
and BATSE, we explore the possibility that XRFs are a low-energy branch of the
GRB population. We find that XRF spectra are similar to those of GRBs, and that
their low peak energies could be an extension of known GRB properties.
