Also known as SNR G043.3-00.2, 3C 398
W49B (also known as SNR G043.3-00.2 or 3C 398) is a nebula in Westerhout 49 (W49). The nebula is a supernova remnant, probably from a type Ib or Ic supernova that occurred around 1,000 years ago. It may have produced a gamma-ray burst and is thought to have left a black hole remnant.
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Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).