出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on INTEGRAL observations of the bright black-hole transient GX 3394 performed
during the 2004 outburst. Our data cover three different spectral states, namely Hard/Intermediate
State (HIMS), Soft/Intermediate State (SIMS), High/Soft State (HSS). Fits of joint IBIS, SPI and
JEM-X data are well represented by hybrid thermal/non-thermal Comptonization (EQPAIR) and
allow us to track the evolution of each spectral component during the transitions. Furthermore,
spectra of GX 3394 in the HIM state show a high energy excess with respect to pure thermal
Comptonization models. We present a summary of these results, extensively discussed in
a recently published work, as well as, a comparison of the 2004 transition with a "secondary"
transition HIMS-to-SIMS observed during the 2007 outburst with RXTE and INTEGRAL, simultaneously.
