  We report on the X-ray observations of the X-ray flash (XRF) which occurred
on 2002 April 27, three days before BeppoSAX was switched off. The event was
detected with the BeppoSAX Wide Field Cameras but not with the Gamma ray Burst
Monitor. A follow-up observation with the BeppoSAX Narrow Field Instruments was
soon performed and a candidate afterglow source was discovered. We present the
results obtained. We also include the results obtained from the observations of
the XRF field with the Chandra X-ray satellite. The spectral analysis of the
prompt emission shows that the peak energy of the EF(E) spectrum is lower than
5.5 keV, with negligible spectral evolution. The X-ray afterglow spectrum is
consistent with a power law model with photon index of about 2, while the 2-10
keV flux fades as a power law with a decay index -1.33. Both these indices are
typical of GRBs. A very marginal excess around 4.5-5 keV is found in the
afterglow spectrum measured by BeppoSAX . As for many GRBs, the extrapolation
of the 2-10 keV fading law back to the time of the prompt emission is
consistent with the X-ray flux measured during the second part of the event. We
estimate a possible range of values of the redshift and discuss our results in
the light of current models of XRFs.
