The figure above shows the light curve and dynamic spectrum of the star IO Vel (HD 83625) after averaging ASKAP EMU data in 5-minute time intervals. (From Lee et al. 2025)

Lee et al. conducted a search for radio transients using 200 hours of archival data from the ASKAP EMU, covering 750 square degrees of sky at the shortest possible imaging time step of 10-seconds. Previous ASKAP radio star searches have primarily used VAST and RACS data, which have observation durations of only 12 and 15 minutes, respectively. Such short observation windows may have missed transients entirely or failed to capture their full duration, limiting the study of their variability. Although no Long Period Transients (LPTs) were detected, they identified flares from six stars. The star IO Vel (HD 83625) has previously been identified as a Main-sequence Radio Pulse emitter (MRP) and has been detected as a radio star in the ASKAP VAST and RACS surveys. The figure above shows the light curve and dynamic spectrum of the transient after averaging the data in 5-minute time intervals. The 10-second peak flux density was 7.3 mJy with a circular polarisation fraction of 73%. The pulse duration is roughly 100 minutes. The team’s findings demonstrate the feasibility of detecting radio transients using 10-second imaging with ASKAP and provide insights into improving detection pipelines and observation strategies for LPTs.