Swift/XRT follow-up of IGR J100043-8702, IGR J10500-6410, IGR J05319-6601 and IGR J11321-5311
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
Credential Certification: Raffaella Landi (landi@iasfbo.inaf.it)
Subjects: X-ray, Gamma Ray, AGN, Star
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.
