Archival optical, near-infrared, mid-infrared and X-ray images of extragalactic FXT candidates; the telescope/instrument + filter and FXT ID name are shown in the upper-left corner. Each cutout is centered on the X-ray position, while red circles denote 2σChandra errors in the source localization (1st, 2nd, 3rd and 4th columns) optical band (DECam, Pan-STARRS and HST) images (5th and 6th columns) near-infrared J or H and K (2MASS, UKIRT or VISTA) images; (7th column) 3.4 μm (unWISE) images; and (8th column) X-ray Chandra (ACIS) 0.5–7 keV images. The colored arrows and circles show the localization of the possible host of the FXT candidates. HST images were aligned using the astrometry of Gaia.