Fig. 4
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Q/I, U/I plot from IPOL observation on the night of 2008 September 29. The position of the optical afterglow (red bars) is now far away from the cluster formed by the field stars, which are still expected to be unpolarised. For this reason, at a confidence level slightly larger than 4σ (see values above the plot), we can state that the optical transient is polarised.
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