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We present four new fast radio bursts discovered in a search of the Parkes70-cm pulsar survey data archive for dispersed single pulses and bursts. Wesearched dispersion measures (DMs) ranging between 0 to 5000 pc cm$^{-3}$ withthe HEIMDALL and FETCH detection and classification algorithms. All four of theFRBs discovered have significantly larger widths ($> 50$ ms) than almost all ofthe FRBs detected and cataloged to date. The large pulse widths are notdominated by interstellar scattering or dispersive smearing within channels.One of the FRBs has a DM of 3338 pc cm$^{3}$, the largest measured for any FRBto date. These are also the first FRBs detected by any radio telescope so far,predating the Lorimer Burst by almost a decade. Our results suggest that pulsarsurvey archives remain important sources of previously undetected FRBs and thatsearches for FRBs on time scales extending beyond $\sim 100$ ms may reveal thepresence of a larger population of wide-pulse FRBs.

Four New Fast Radio Bursts Discovered in the Parkes 70-cm Pulsar Survey Archive