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Two spectral states of the transient X-ray burster SAX J1747.0-2853
L. Natalucci, A. Bazzano, M. Cocchi +4
The neutron star binary SAX J1747.0-2853, located in the Galactic Center region at about 0.5 deg from Sgr A* and at a distance of 9 kpc, has been observed in outburst four times (1…
Detection of hard X-ray emission from the Galactic nuclear region with INTEGRAL
G. Belanger, A. Goldwurm, P. Goldoni +13
This letter presents the first results of an observational campaign to study the Galactic Centre with INTEGRAL. The mosaicked images obtained with the IBIS/ISGRI coded aperture ins…
INTEGRAL discovery of a bright highly obscured galactic X-ray binary source IGR J16318-4848
R. Walter, J. Rodriguez, L. Foschini +8
INTEGRAL regularly scans the Galactic plane to search for new objects and in particular for absorbed sources with the bulk of their emission above 10-20 keV. The first new INTEGRAL…
IBIS preliminary results on Cygnus X-1 spectral and temporal characteristics
A. Bazzano, A. J. Bird, F. Capitanio +11
We report preliminary results of a broadband spectral and temporal study of the black-hole binary Cyg X-1 performed with the IBIS telescope. Cyg X-1 was the first pointed celestial…
Early SPI/INTEGRAL measurements of galactic 511 keV line emission from positron annihilation
P. Jean, J. Knoedlseder, V. Lonjou +18
We report the first measurements of the 511 keV line emission from the Galactic Centre (GC) region performed with the spectrometer SPI on the space observatory INTEGRAL (Internatio…
First IBIS results on the high energy emission of Cyg X-2
L. Natalucci, M. Del Santo, P. Ubertini +4
The bright low-mass X-ray binary Cyg X-2 was in the field of view of the IBIS telescope during the early Cygnus region observations, executed during the INTEGRAL Performance Verifi…