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ROSAT performed about 250 PSPC observations pointed towards the Magellanic Clouds (MCs). A systematic analysis of the data yielded catalogues with more than 750 X-ray sources in the LMC and about 520 in the SMC region. Cross-correlations with catalogues from various other wavelength bands and utilizing the derived X-ray properties allowed to identify a significant fraction of the X-ray sources and to classify many unknown sources as candidates for X-ray binaries, supernova remnants and supersoft sources in the MCs. This makes it possible to study in detail the source populations in these nearby galaxies on a large statistical basis. [ABSTRACT FROM AUTHOR]

We present a preliminary analysis of BeppoSAX observations of two Intermediate Polars, which show different temporal and spectral properties, characteristics of different accretion modes. [ABSTRACT FROM AUTHOR]

The evolution of the γ-ray emission from GRO J0422+32 after its main outburst of August 1992 was followed by COMPTEL during 25 observation periods (VPs) between August 1992 and August 1997, where NPer 92 was in the FoV of COMPTEL, and for 3 VPs preceding the nova outburst. It is found that the NPer 92 γ-ray emission is greatly confined to energies between 1.5 and 2.0 MeV. This emission is prominent during observations that correspond to phases between 0.0 and 0.5 of the ~ 120 days period discovered in the nova optical emission. This periodical activity of the nova in form of mini-outbursts is supported by the detection of the γ-ray emission from GRO J0422+32 in seven episodes up to ~ 1800 days (August 1997) after the main outburst, and by the All Sky Monitor's (ASM, Rossi XTE) detection of X-ray mini-outbursts (four episodes). In one episode we have succeeded to derive a contemporaneous spectrum based on the measurements by COMPTEL, ASM and BATSE. The plausible mechanisms of the GRO J0422+32 periodical mini-outbursts and of its characteristic γ-ray emission are discussed. The possibility of the system being a triple is also evaluated. [ABSTRACT FROM AUTHOR]