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Fig. 1

image

NGC 5806 imaged by HST using WFC filters F435W, F555W, and F814W during 2004 when SN 2004dg occurred in the galaxy. Regions with strong Hα emission (F658N) are shown in red (Credits: ESA/NASA/Andre van der Hoeven). Panel a) shows the locations of PTF12os, PTF13bvn, SN 2004dg, and SN Hunt 248 marked by white boxes. Bright H ii regions of which we have obtained spectra are indicated by colored circles. Panel b) displays a close-up view of the location of the PTF12os progenitor candidate (black circle). SN 2004dg, which exploded close to the position of PTF12os, is indicated by a red circle. Panel c) shows a close-up view of the location of iPTF13bvn, with the progenitor candidate marked by a black circle. Panel d) highlights the location of SN Hunt 248, which is marked by a black circle. North is up and east is to the left in all panels.

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