标题： INTEGRAL对重复快速X射线瞬变源的观测 显示英文标题

标题： INTEGRAL observations of recurrent fast X-ray transient sources

摘要： 快速X射线暂现源（FXTs）被认为是持续时间不到一天且出现在偶然位置的非重复明亮X射线源，它们可以通过具有足够宽视场和高灵敏度的仪器最好地被探测和发现。 INTEGRAL卫星上的IBIS/ISGRI仪器特别适合探测新的或已知的快速X射线暂现源。 我们报告了IBIS/ISGRI对三个位于银河低纬度的快速暂现源新爆发的探测：SAX J1818.6-1703；IGR J16479-4514；IGR J17391-302/XTE J1739-302。 所报告的结果确认并加强了这些源的非常快速暂现性质，因为所有新探测到的爆发持续时间都小于约3小时。 此外，它们提供了可能的重复快速暂现行为的第一个证据，因为在过去的两年中，ISGRI多次探测到了这三个源的爆发状态。 显示英文摘要

摘要： 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 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 about 3 hours. 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.