Fig. 11.

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Optical images around eRASSU J060839.5−704014. Top: GROND g′ band image. The large white circle (radius 5″) marks the eROSITA error circle and the red circle indicates the 1σ position uncertainty obtained from the XMM-Newton/EPIC X-ray images. The small white circle marks the position of the proposed optical counterpart. The three nearest Gaia objects are marked, demonstrating the good astrometric quality of the XMM-Newton data. Bottom: zoomed-in archival DECam image centred on the optical counterpart from the top figure. The image is produced from a number of exposures, which were co-added to create the individual filter images for the presented colour composite. The data are taken from the Legacy Survey release 10 (DR10).
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