If confirmed #S190503bf is likely another merging #BlackHole pair. With @LIGOLA @LIGOWA & @ego_virgo all online, its direction on the sky is pinned down fairly well: to within three "blobs" of about 400 sq deg, not too far from Sirius in the southern sky #O3ishere 2/3 pic.twitter.com/v6F0hnGKXN

— LIGO (@LIGO) May 3, 2019