Astronomy and Astrophysics – Astrophysics – High Energy Astrophysical Phenomena
Scientific paper
2011-11-03
Astronomy and Astrophysics
Astrophysics
High Energy Astrophysical Phenomena
2011 Fermi Symposium proceedings - eConf C110509; 6 pages, 4 figures, 2 tables
Scientific paper
We present the most recent results from our investigation on Supergiant Fast X-ray Transients, a class of High-Mass X-ray Binaries, with a possible counterpart in the gamma-ray energy band. Since 2007 Swift has contributed to this new field by detecting outbursts from these fast transients with the BAT and by following them for days with the XRT. Thus, we demonstrated that while the brightest phase of the outburst only lasts a few hours, further activity is observed at lower fluxes for a remarkably longer time, up to weeks. Furthermore, we have performed several campaigns of intense monitoring with the XRT, assessing the fraction of the time these sources spend in each phase, and their duty cycle of inactivity.
Burrows David N.
Cusumano Giancarlo
Esposito Paolo
Gehrels Neil
Kennea Jaime A.
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