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Session 46 - Gamma-ray Sources & Diffuse Emission.
Display session, Tuesday, January 16
North Banquet Hall, Convention Center
Bright, day-long transient emission features near 0.5 MeV were reported by the Sigma telescope on the Granat spacecraft from the Crab, ``microquasar'' 1E 1740.7-2942, and Nova Muscae, an x-ray nova and black hole candidate (Gilfanov et al., Ap. J. Suppl., 92, 411, 1994). We have searched data from the Burst and Transient Source Experiment (BATSE) on the Compton Gamma-Ray Observatory from June 1991 to December 1993 for such transients, and do not find any candidate events. Two of the specific events reported by Sigma were not seen, to better than twice Sigma's sensitivity. We have, however, observed the permanent 511 keV positron-annihilation line from the direction of the Galactic Center, and will report on the progress of an effort to test this line for variability and to map its distribution in Galactic longitude.
