10^{31}$ J) and brightness temperatures (${T}_\mathrm{b} >10^{33}$ K) necessitate a coherent emission mechanism, while the short durations of the pulses suggest a very compact source of origin [@Luan; @Dennison]. The 18 FRBs published to date (refer to the FRBCAT repository$^{\ref{frbcat}}$ for the complete list) have been discovered in either post-processing of archival surveys or, in real-time, using the Parkes radio telescope with the exception of two, detected at the Arecibo [@Spitler] and Green Bank telescopes All but one of the bursts have been found at 1.4 GHz, with the exception being the GBT burst, which was seen at 800 MHz.

The observed FRB all-sky rate is very high. [@Champion] derive a rate of $7^{+5}_{-3} \times 10^{3}$ events sky$^{-1}$ d$^{-1}$ at 1.4 GHz for bursts between 0.13 and 1.5 Jy ms in fluence and widths in the range 0.128 ms to 16 ms. The high FRB rate is a major constraint on theories for their origin. Until recently, such theories have generally assumed they are cataclysmic events, in which the progenitor is obliterated. However, one FRB is now known to repeat in a non-periodic manner [FRB 121102, @nat_spitler], opening up possibilities for other progenitor models. Following the discoveries reported in this 