Journal
ASTRONOMY & ASTROPHYSICS
Volume 444, Issue 1, Pages 221-231Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361:20053103
Keywords
X-rays : bursts; X-rays : individuals : IGR J16479-4514; X-rays : individuals : SAX J1818.6-1703; X-rays : general; X-rays : individuals : XTE J1739-302/IGR J17391-302; X-rays : binaries; gamma rays : observations
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Fast X-ray Transients (FXTs) are believed to be non-recurrent bright X-ray sources lasting less than a day and occuring at serendipitous positions, they can best be detected and discovered by instruments having a sufficiently wide field of view and high sensitivity. The IBIS/ISGRI instrument onboard INTEGRAL is particularly suited to detect new or already known fast X-ray transient sources. We report on IBIS/ISGRI detection of newly discovered outbursts of three fast transient sources located at low Galactic latitude: SAX J1818.6-1703; IGR J16479-4514; IGR J17391-302/XTE J1739-302. The reported results confirm and strengthen the very fast transient nature of these sources, given that all their newly detected outbursts have a duration less than similar to 3 h. Additionally, they provide the first evidence for a possible recurrent fast transient behaviour as all three sources were detected in outburst by ISGRI more than once during the last 2 years.
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