As of this writing, the Compton Gamma-Ray Observatory has been in orbit for nearly six years. In recent years, utilization of the EGRET instrument aboard the observatory has been reduced due to the dwindling supply of spark chamber gas. During Cycle 6, EGRET was on only half the time and even then, operating in a mode with a reduced field-of-view. The nominal energy range for EGRET is 20 MeV to 30 GeV. Of the other instruments on the Compton Observatory "bus", Comptel's energy coverage extends to about 30 MeV and BATSE to about 2 MeV. The nominal range for OSSE is 50 keV to 10 MeV. Once EGRET is out of gas, this high end of the energy spectrum will be out of range for CGRO.
While the nominal energy range for OSSE extends only to about 10 MeV, incorporated into the instrument's design were an additional 16 energy channels, each about 16 MeV wide, which can, in principle, extend the energy coverage for OSSE up to 256 MeV. These channels are called OSSE High-Range data (Johnson et al. 1989). This capability was incorporated into OSSE to provide solar gamma-ray and neutron response. The question being asked in this report is "can this OSSE energy range provide useful data on other objects, thereby filling in for some of the spectral coverage lost to EGRET?". Unfortunately, but for a very limited number of sources, the answer must be no.