  The FREGATE gamma ray detector of HETE-2 is sensitive to photons between 6
and 400 keV. This sensitivity range, extended towards low energies, allows us
to explore the emission of GRBs in hard X-rays. We fit the spectra of 23 GRBs
with Band's spectral function in order to derive the distribution of their peak
energies (E-peak). This distribution is then compared with the E-peak
distributions measured by BATSE and GINGA.
