In the following, we report on a preliminary study aimed at searching the X-ray counterpart to a set of still unassociated sources listed in the Palermo Swift/BAT 100-month catalogue. By exploiting the capability of the X-ray telescope (XRT, 0.2-10 keV) onboard the Neil Gehrels Swift Observatory to localise the sources with a positional accuracy of few arcseconds, the search for optical/UV, infrared, and radio counterparts is more efficient and reliable. Each source is discussed in a dedicated section in which we report the log of the XRT observations, the likely counterparts detected, their spectral behaviour, and their multi-wavelength properties.
Landi et al. (2026) studied this question.