Left panel: LOFAR 1000″ × 1000″ image of the field around β UMi. Right panel: a zoomed in 300″ × 300″ version of the image shown in the left panel. The restoring beam FWHM is displayed in red in the lower left corner of both images and has dimensions 7.3″ × 5.4″. Contours are set to (−3, 3, 6, 9, 12, 15, 30, 45) × σrms, where σrms = 190 μ Jy beam−1 and is the rms noise at the target position. The red crosshairs mark the expected position of β UMi at the epoch of observation.
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