Abstract

Various arguments indicate that a number of galactic X-ray sources may be binary systems containing a black hole. A dominant characteristic of these sources is their high degree of variability over a wide range of time scales. BATSE (the Compton Burst and Transient Source Experiment) functions as a sensitive all-sky monitor, affording an unprecented opportunity to study the hard X-ray properties of galactic black hole candidates (BHCs). We summarize BATSE observations of the persistent BHCs Cygnus X-1 and GX 339–4 and the transient BHCs X-Nova Muscae 1991 (GRS/GS 1124–68), GRO J0422+32 (X-Nova Persei 1992), GRS 1009–45 (X-Nova Velorum 1993), and GRO J1719–24 (GRS 1716–249≡X-Nova Ophiuchi 1993).

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