# A new fast radio burst in the datasets containing the Lorimer burst

## TL;DR

This paper reports the discovery of a new fast radio burst (FRB) in archival data, which is broader, has a higher dispersion measure, and predates the Lorimer burst, suggesting more such events are hidden in existing datasets.

## Contribution

The paper presents the first detection of a high-dispersion, broad FRB in archival data, expanding the known properties and potential frequency of such bursts.

## Key findings

- Discovery of FRB 010312 with high dispersion measure
- Re-detection of the Lorimer burst in the same dataset
- Indication of more undetected FRBs in archival data

## Abstract

We report the discovery of a new fast radio burst (FRB), FRB~010312, in archival data from a 1.4\,GHz survey of the Magellanic Clouds using the multibeam receiver on the Parkes 64\,m-diameter radio telescope. These data sets include the Lorimer burst (FRB~010724), which it pre-dates and which we also re-detect. The new burst has a much higher dispersion measure of 1187\,cm$^{-3}$pc. The burst is one of the broadest found to date, the second earliest FRB known, and the ninth FRB discovered with a dispersion measure larger than 1000\,cm$^{-3}\,$pc. Our discovery indicates that there are likely to be more burst events still to be found in the existing Parkes data archive.