Fitting of combined Ulysses/COMPTEL GRB spectra

We have analyzed the Ulysses and COMPTEL spectral data from several strong and hard γ-ray bursts which occurred in the COMPTEL field of view. Single instrument data with their limited energy range often can be fit with single power law models. In contrast, the composite spectra obtained by a joint deconvolution of the Ulysses and COMPTEL spectra (ranging from 20 keV up to 10 MeV) need models with continuous curvature. The applicability of standard emission processes to these composite spectra is discussed.