A&A 456, L5-L8 (2006)
DOI: 10.1051/0004-6361:20065456
Letter
Swift, RXTE, and INTEGRAL observation of Swift J1922.7-1716
M. Falanga1, 2, T. Belloni3 and S. Campana31 CEA Saclay, DSM/DAPNIA/Service d'Astrophysique (CNRS FRE 2591), 91191 Gif-sur-Yvette, France
e-mail: mfalanga@cea.fr
2 Unité mixte de recherche Astroparticule et Cosmologie, 11 place Berthelot, 75005 Paris, France
3 INAF - Osservatorio Astronomico di Brera, via Bianchi 46, 23807 Merate, Italy
(Received 19 April 2006 / Accepted 1 July 2006)
Abstract
We report the results of analyzing Swift, RossiXTE,
and INTEGRAL data of Swift J1922.7-1716, a likely transient X-ray source
discovered by Swift/BAT. Both the fast variability measured by the
RXTE/PCA and the combined Swift/XRT, RXTE/PCA, and
INTEGRAL/ISGRI (0.5-100 keV) energy spectrum suggest that the
system is a neutron-star low-mass X-ray binary or a black-hole candidate at low
accretion levels. The non-simultaneous spectra are consistent with the
same spectral shape and flux, suggesting little variability over the
period July to October 2005, but the analysis of archival INTEGRAL
data shows that the source was not detected in 2003-2004, suggesting
a transient or strongly variable behavior.
Key words: stars: individual: Swift J1922.7-1716 -- X-rays: binaries
© ESO 2006
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