A&A 444, 221-231 (2005)
DOI: 10.1051/0004-6361:20053103

INTEGRAL observations of recurrent fast X-ray transient sources

V. Sguera¹, E. J. Barlow¹, A. J. Bird¹, D. J. Clark¹, A. J. Dean¹, A. B. Hill¹, L. Moran¹, S. E. Shaw^{1, 2}, D. R. Willis¹, A. Bazzano³, P. Ubertini³ and A. Malizia<sup>4

1</sup>  School of Physics and Astronomy, University of Southampton, Highfield, SO17 1BJ, UK
    e-mail: sguera@astro.soton.ac.uk
²  INTEGRAL Science Data Center, 1290 Versoix, Switzerland
³  IASF/CNR, via Fosso del Cavaliere 100, 00133 Roma, Italy
⁴  IASF/CNR, via Piero Gobetti 101, 40129 Bologna, Italy

(Received 21 March 2005 / Accepted 17 August 2005 )

Abstract
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 ~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.

Key words: 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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