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Fig. 4

image

Zoom of a reduced 300 s ESO-NTT EFOSC2 recent image of the XMMSL1J063045 field in the V filter (09/01/2016, about four years after XMMSL1J063045 X-ray detection). The image is 0.9′ × 0.9′, north is up, east is left. A dim extended source, possibly the XMMSL1J063045 host galaxy, is visible within 2.5′′ from XMMSL1J063045 UVOT position (green circle).

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