Characteristics of Gamma-Ray Bursts at MeV Energies Measured by COMPTEL

         R.M. Kippen, J. Ryan, A. Connors, M. McConnell 
                 (University of New Hampshire)

                          C. Winkler
                (Astrophysics Division, ESTEC)

      V. Schoenfelder, J. Greiner, M. Varendorff, W. Collmar 
       (Max-Planck Institut fuer Extraterrestrische Physik)

                    W. Hermsen and L. Kuiper 
                         (SRON-Utrecht)

We present results from the spectral analysis of 27 gamma-ray bursts
measured by the COMPTEL "Telescope" instrument (0.75--30 MeV) during
four years (April 1991 - April 1995) of observations.  The time-
averaged spectra of these events above 1 MeV are consistent with a
simple power law model with spectral index in the range 1.5--3.5,
whereas simple thermal models are statistically inconsistent with the
burst sample.  We find good agreement between burst spectra measured
simultaneously by BATSE, COMPTEL and EGRET, which typically show a
spectral transition or ``break'' in the BATSE energy range around a
few hundred keV followed by simple power law emission extending to
hundreds of MeV.  Observations of rapid intensity variations up to a
few MeV in the stronger bursts are used to investigate the importance
of photon-photon opacity and to place limits on source distance and
bulk Lorentz factor.

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