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ATEL # 991; R. Landi (INAF/IASF Bologna), J. Kennea (PSU), P. Giommi (ASDC), V. Sguera (Univ. Southampton), and F. Capitanio (INAF/IASF Rome)
on 7 Feb 2007; 16:24 UT
Password Certification: Raffaella Landi (email@example.com)
Subjects: X-ray, Gamma Ray, AGN, Stars
The still unidentified INTEGRAL sources, IGR J10043-8702, IGR J10500-6410, IGR J05319-6601 and IGR J11321-5311 have recently been observed with the Swift/XRT X-ray telescope. All sources are extremely variable, with the first two being visible only in a single 2 ks INTEGRAL pointing (Paizis et al., 2006, Atel 865), and the other two being detected in a limited number of observation sequences (Gotz et al. 2006, A&A, 448, 873; Revnivtsev et al., 2006, A&A, 448, 873). In each of the above cases, we do not detect any X-ray object above 3 sigma confidence level within the published IBIS/ISGRI error box; similarly, no X-ray source is visible around the INTEGRAL uncertainty circle. Only in the case of IGR J05319-6601, a bright X-ray source, known as the High mass X-ray binary RX J0531.2-6609, is detected at 7.5 arcmin from the IBIS/ISGRI position.