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The distortions in the thermal energy spectra for neutrinos produced in asupernova when a resonant oscillation, MSW effect, occurs are determined. Inorder to show this effect for some relevant and representative examples ofunified gauge models, we have chosen $SO(10)$, and $SU(5)_{SUSY}$,$SO(10)_{SUSY}$ with a particular scheme for fermion masses (DHR model). Theanalysis has been performed for two choices of neutrinos parameters, predictedby the above models, and capable to explain the solar neutrino problem. In bothcases one observes a strong distortion in the electron neutrino energyspectrum. This effect, computed for a wide range of $SO(10)_{SUSY}$ models hasproduced the same results of the previous supersymmetric ones.Comment: 14 pages, plain LaTeX, 6 figures, revised version to be published in  Z. Phys.

Supernova neutrino energy spectra and the MSW effect