Fig. 1

Top panel: PTF11mnb (indicated by a black cross) and its host galaxy in a composite Bgr image (with inverted colors) from P60 observations taken on 28 October 2011. The orientation of the image is indicated in the bottom-right corner, whereas the scale is shown in the bottom left. Bottom panel: TNG spectrum of the host galaxy of PTF11mnb obtained in 2016. The main emission lines are identified.
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