Fig. 2
Top panel: Bgri absolute-magnitude light curves of iPTF15dtg from P48, P60, and NOT. The main peak is fit by low-order polynomials, shown as dashed lines. The epochs of spectral observations are indicated by vertical black segments. Pre-explosion magnitude limits in the g-band are indicated by triangles. In the gri filters, we notice the presence of an early peak, unprecented among spectroscopically normal SNe Ic. Bottom panel: the early Bgri light curves of iPTF15dtg.
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