Fig. 1.
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Top panel: Discovery image from the Ondřejov 0.5 m telescope. The optical afterglow of GRB 210312B is marked. The image covers 10′ per side. Bottom panel: gri image (value inverted) from the 2×8.4 m LBT telescope. The location of the optical afterglow of GRB 210312B is marked. The double structure of the underlying object is clearly visible. This image has a dimension of 1.5′×1.5′.
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