  Gamma-ray bursts can be divided into three groups: short-, intermediate and
long-duration bursts. While the progenitors of the short and long ones are
relatively known, the progenitor objects of the intermediate-duration bursts
are generally unknown, however, recent statistical studies suggest, that they
should be related to the long-duration bursts. In this work we investigate
whether there is a differ- ence between the global parameters of the X-ray
flashes and intermediate-duration group of gamma-ray bursts. The statistical
tests do not show any significant discrepancy regarding most of the parameters,
except the BAT photon index, which is only a consequence of the defintion of
the X-ray flashes.
