Here is the first paper (from 2007) reporting a fast radio burst of extragalactic origin: https://arxiv.org/pdf/0709.4301 https://arxiv.org/pdf/0709.4301 See p

Here is the first paper (from 2007) reporting a fast radio burst of extragalactic origin: https://arxiv.org/pdf/0709.4301 https://arxiv.org/pdf/0709.4301 See page 12. Since then there have been many papers about FRBs. Typically you can find them on arxiv.