Swift/XRT follow-up of IGR J100043-8702, IGR J10500-6410, IGR J05319-6601 and IGR J11321-5311

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.