A two-minute burst of highly polarized radio emission originating from low Galactic latitude

Abstract

Several sources of repeating coherent bursts of radio emission with periods of many minutes have now been reported in the literature. These 'ultralong period' (ULP) sources have no clear multiwavelength counterparts and challenge canonical pulsar emission models, leading to debate regarding their nature. In this work, we report the discovery of a bright, highly polarized burst of radio emission at low Galactic latitude as part of a wide-field survey for transient and variable radio sources. ASKAP J175534.9252749.1 does not appear to repeat, with only a single intense two-minute 200-mJy burst detected from 60 h of observations. The burst morphology and polarization properties are comparable t..