Fast Radio Bursts Statistics

Fast Radio Bursts (FRBs) were first discovered in pulsar search data in 2007, they are intense radio flashes and characterized by millisecond durations and Jansky-level flux densities. FRBs are single pulses which are similar to pulses from radio pulsars. They have unexpectedly high dispersion measures (DM) than those from the modeled DM up limits from the entire Milky Way Interstellar Medium (ISM) in the same line of sight. They can be a powerful probe for studying the ionized intergalactic medium and the spatial distribution of free electrons. We carried out a statistical analysis on the 52 FRBs discovered by the Parkes, GBT, Arecibo, UTMOST and ASKAP until June 2018. After subtracting the DM values which were from the modeled interstellar medium of our Galaxy, their mean dispersion measure is 584.5 pc·cm^-3, supporting the conclustion of their cosmological origin. The Power-law distribution can be described as dN/dF_obs=4.14±1.30×F_obs^-1.12055 sky^-1·day^-1. After the Five-hundred-meter Aperture Spherical radio Telescope (FAST) deploying the L-band 19-beam array, the Commensal Radio Astronomy FAST Survey (CRAFTS) will be able to detect about 10 FRBs every year.This will effectively expand the sample of FRBs and provide iImportant information on FRB's research.