FRB121102

FRB121102 was the first fast radio burst (FRB) known to repeat, i.e., additional FRBs have come from the same direction, This created much research interest given the opportunities to locate and study the source and study the repeating FRBs in more depth. As of 9/2022, hundreds of bursts have been detected from that location, as well as a persistent radio source (apparently synchrotron radiation) and an optical source consisting of a dwarf galaxy with redshift 0.193. Also, a 157-day cycle has been discerned, consisting of some weeks of activity followed by a longer quiescent time, suggestive of an orbital period. Theories include some involving flashes from a neutron star.