Close-up images (0.5–7 keV energy range) of our Chandra detections (listed by their ObsIDs; from left to right): 16723, 16725 and 16726. The blue circles indicate the source extraction regions and the dashed red annuli the background extraction regions. The green circle is the Swift/XRT error region of the source reported by Shaw et al. (2009). See Sects. 2.1 and 2.2 for more details about the detections and upper limits.