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Proceedings of The Extreme sky: Sampling the Universe above 10 keV — PoS(extremesky2009)
Supergiant Fast X-ray Transients (SFXTs) are a new class of High Mass X-ray Binaries, discovered by the INTEGRAL satellite, which display flares lasting from minutes to hours, with peak luminosity of 10 36 − 10 37 erg s −1 . Outside the bright outbursts, they show a frequent long-term flaring activity reaching an X-ray luminosity level of 10 33 − 10 34 erg s −1 , as recently observed with the Swift satellite. Since a few persistent High Mass X-ray Binaries (HMXBs) with supergiant donors showdoi:10.22323/1.096.0061 fatcat:byrcx4l3zvfrretnq7ff7ziree