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Astronomers Observe Supernova and Find They’re Watching Rerunshttp://www.nytimes.com/2015/03/06/science/astronomers-observe-supernova-and-find-theyre-watching-reruns.html?hp&action=click&pgtype=Homepage&module=first-column-region®ion=top-news&WT.nav=top-news&_r=0http://nyti.ms/18midQe
In that case they are really variable stars with a loooooong period of variability and greater than normal variation of intensity.