Images of the sky region around J1109 in different broad X-ray energy ranges obtained using different instruments. Top panel: INTEGRAL IBIS/ISGRI 20–40 keV mosaicked image. Galactic coordinates are reported. The grey scale is proportional to the X-ray flux. All sources detected in the field are labelled (J1109 is labelled in bold). Lower panels, left: NuSTAR FPMA+FPMB 3–79 keV image with sub-pixel binning. The 50 arcsec circle adopted to extract the source photons is overlaid. The colour code indicates the S/N at the different positions in the image. Lower panels, right: Swift BAT 15–150 keV image. The colour code indicates the S/N at the different positions in the image (negative values are in logarithmic scale). Different scales have been adopted for the images in the lower panels (more enlarged from left to right).