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Fig. 1

image

Left panel: image from the DSS catalogue before the XMMSL1J063045 detection in X-rays. No counterparts are visible within the XMMSL1J063045 Slew error circle (green circle). Central panel: Swift UVOT uvw1 filtered image immediately subsequent to XMMSL1J063045 detected X-ray ignition. A possible counterpart appears within the XMMSL1J063045 Slew error circle (green) and within 5′′ from the source UVOT position (red circle). Right panel: Swift UVOT uvvv filtered image, obtained about four years after the uvw1 filtered observation. No counterparts are visible either within the XMMSL1J063045 Slew error circle (green circle) or within 5′′ from the source UVOT position (red circle). The images are 3.4′ × 3.4′, north is up, east is left.

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