Fig. 4.
Top, blue: optical iPTF light curve of V07979 from 31 January 2013 (Fig. 1 left panel), and bottom, black: X-ray flare at the position of V07979 from an XMM-Newton observation of the central part of M 31 on 28 January 2008 produced by the PPS of XMM-Newton SSC. The horizontal axis shows time with respect to the corresponding peak time for both light curves.
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