  Studying the GRBs' gamma-ray spectra may reveal some physical information of
Gamma-ray Bursts. The Fermi satellite observed more than two thousand GRBs. The
FERMIGBRST catalog contains GRB parameters (peak energy, spectral indices,
intensity) estimated for both the total emission (fluence), and the emission
during the interval of the peak flux. We found a relationship with linear
discriminant analysis between the spectral categories and the model independent
physical data. We compared the Swift and Fermi spectral types. We found a
connection between the Fermi fluence spectra and the Swift spectra but the
result of the peak flux spectra can be disputable. We found that those GRBs
which were observed by both Swift and Fermi can similarly discriminate as the
complete Fermi sample. We concluded that the common observation probably did
not mean any trace of selection effects in the spectral behavior of GRBs.

High Energy Astrophysical Phenomena