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27th of September 2022
Four New Fast Radio Bursts Discovered in the Parkes 70-cm Pulsar Survey Archive
by Crawford et al.
Crawford et al. present four new fast radio bursts discovered in a search of the Parkes 70-cm pulsar survey data archive for dispersed single pulses and bursts. A total of 719905 single pulse candidates were detected in the survey, of which 75774 were classified as possibly real. All but 7 of the classified signals were either rejected by eye as not morphologically realistic or were determined to have come from known pulsars. The fact that all but a handful of these signals were associated with known sources after checking the pulsar catalog illustrates the large number of known single pulse emitters present in the survey data. Of the 7 unidentified signals, three were weak pulses with narrow widths and small Dispersion Measures, indicating likely Rapidly Rotating Transients (RRATs) in our Galaxy. The four FRBs discovered have significantly larger widths (> 50 ms) than almost all of the FRBs detected and cataloged to date, however, the large pulse widths are not dominated by interstellar scattering or dispersive smearing within channels. The image above shows the detection plot of FRB920913, which has a Dispersion Measure of 3338 pc/cm^3, the largest measured for any FRB to date, suggesting it is one of the most distant FRBs detected. The panels show the dedispersed pulse profile for the burst (top), signal strength (brightness) vs. frequency and time for the dedispersed pulse (middle), and signal strength (brightness) vs. DM and time (bottom). The results suggest that pulsar survey archives remain important sources of previously undetected FRBs and that searches for FRBs on time scales extending beyond ∼100 ms may reveal the presence of a larger population of wide-pulse FRBs.

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