First CHIME/FRB Fast Radio Burst Catalog

Through injection of simulated events into our detection pipeline, we perform an absolute calibration of selection effects to account for systematic biases. We find evidence for a population of FRBs-composing a large fraction of the overall population-with a scattering time at 600MHz in excess of 10ms, of which only a small fraction are observed by CHIME/FRB. We infer a power-law index for the cumulative fluence distribution of {alpha}=-1.40+/-0.11(stat.)_-0.09_^+0.06^(sys.), consistent with the -3/2 expectation for a nonevolving population in Euclidean space.

We find that {alpha} is steeper for high-DM events and shallower for low-DM events, which is what would be expected when DM is correlated with distance. We infer a sky rate of [820+/-60(stat.)_-200_^+220^(sys.)]/sky/day above a fluence of 5Jy.ms at 600MHz, with a scattering time at 600MHz under 10ms and DM above 100pc/cm^3^.