Reprocessing of the Parkes 70 cm Survey and Discovery of a New Radio Pulsar in the Large Magellanic Cloud

We have reprocessed the data archived from the Parkes 70 cm (PKS70) pulsar survey with an expanded dispersion measure (DM) search range and an acceleration search. Our goal was to detect pulsars that might have been missed in the original survey processing. Of the original 43,842 pointings, 34,869 pointings were archived, along with 440 additional pointings for confirmation or timing. We processed all of these archived data and detected 359 known pulsars: 265 of these were detected in the original survey, while an additional 94 currently known pulsars were detected in our reprocessing. A few among those 94 pulsars are highly accelerated binary pulsars. Furthermore, we detected 5 more pulsars with DMs higher than the original survey thresholds, as well as 6 more pulsars below the nominal survey sensitivity threshold (from the original survey beams with longer integrations). We missed detection of 33 (of the 298) pulsars detected in the original survey, in part because of portions of the survey data missing in the archive and our early-stage candidate sifting method. We discovered one new pulsar in the reanalysis, PSR J0540−69, which has a spin period of 0.909 s and resides in the Large Magellanic Cloud (LMC). This new pulsar appeared in three PKS70 beams and one additional L -band observation that targeted the LMC pulsar PSR B0540−69. The numerous pulsar detections found in our reanalysis and the discovery of a new pulsar in the LMC highlight the value of conducting multiple searches through pulsar data sets.