i-band (left) and 3.6 μm (right) images. Image size is 8″ × 8″. North is up and east is to the left. The position of the X-ray source is at the center of each panel. The circle of 4″ radius from the X-ray position is shown. The white rectangular region in the lower right part of the i-band image of J022154.7−032558 is an artifact due to background subtraction in the mosaicked image.