Itself. Anything in its star system. Any biospheres or sub-FTL civilizations within dozens of light-years. Quite a few idiots, who were trying to get selfies for social media. Probably some stubborn old locals, who refused to evacuate. ("My family has lived in this star system since before ... and you young busybodies are always telling us how it's gonna explode any time now ... and trying to force us out of our own homes ... and when has anything actually exploded after you damn busybodies claimed ... just trying to steal our homes, that's what you're doing ... ":)