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Fig. A.1.

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GROND z′-band image of GRB 081127 from the 55 min co-add of the first night (left), showing the optical afterglow within the 1 . $ \overset{\prime \prime }{.} $8 XRT error circle (drawn here with a 3″ radius for better visibility), and the second epoch from 26 Aug. 2016 (right).

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