Observations of bright X-ray transients by MIR-KVANT module in 1988-1996

MIR-KVANT module being on the orbit during ten years since 1987 was able to observe a set of bright X-ray transients from Vul X-Nova in 1988 to GRS1739-278 in 1996. Broad-band X-ray spectra and temporal variability of them are discussed. The most of studied transients belong to X-ray Novae - group of X-ray transients with common observational features. The transients appear at X-ray sky with a frequency about 1-1.5 per year and are available for observations by experiments with ~ 10 mCrab sensitivity during few monthes after the outburst. Measured mass function several of those objects exceeds 3 solar masses and considered to be a solid prove of black-hole presense in the system. Other exotic objects observed were Galactic 'microquasars' GRS1915+105 and GRO J1655-40, also pulsar-burster GRO J1744-28. Almost all of the objects discussed were discovered by X-ray all-sky monitors ``Ginga'', WATCH/GRANAT, BATSE/GRO, so they are sources of primary interest for future all-sky monitors. From the other hand most of these objects are located in densely populated Galactic Center region which requires quite good angular resolution for fine studies.