In December 2019, the CHIME telescope picked up a signal with a crisp periodicity of 217 ms, hailed as the first periodic FRB. It later turned out to be a series of giant pulses from the long-known pulsar PSR J0248+6021, misprojected 20 degrees to the south. The culprit was a crack in the mathematic
arXiv:2606.07087v1 · 2026-06-05