Outburst of the X-ray transient SAX J1818.6-1703 detected by INTEGRAL in September 2003

Abstract

During the observation of the Galactic-center field by the INTEGRAL observatory on September 9, 2003, the IBIS/ISGRI gamma-ray telescope detected a short (several-hours-long) intense (~380 mCrab at the peak) outburst of hard radiation from the X-ray transient SAX J1818.6-1703. Previously, this source was observed only once in 1998 during a similar short outburst. We present the results of our localization, spectral and timing analyses of the object and briefly discuss the possible causes of the outburst. The release time of the bulk of the energy in such an outburst is appreciably shorter than the accretion (viscous) time that characterizes the flow of matter through a standard accretion disk.

16 pages, 7 figures, to be published in Astronomy Letters, v. 31, n. 10, p. 672 (2005)

References in corpus (3)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• A half-a-day long thermonuclear X-ray burst from KS 1731-260
• Superbursts at near-Eddington mass accretion rates

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• Discovery of a 30 day period in the supergiant fast X-ray transient SAX J1818.6-1703
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