Pre-discovery light curve for the position of iPTF13z, from P48 (Mould R-band). The upper panel shows the light curve; triangles indicate upper limits from the PSF photometry and red symbols detections. The filled blue circles are binned representations of the detections (10-day bins). The lower panel shows the same measurements in counts, with dashed horizontal lines showing the mean (green) and standard deviations (1σ, red; 2σ, blue; 3σ, purple) of the counts from all pre-discovery observations. The dashed vertical lines show the period from which the frames for the reference stack were taken.
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