Description
Fast radio bursts (FRBs) are enigmatic millisecond-duration radio transient flashes of extragalactic origin. Studying burst properties such as dispersion measure allows us to probe the turbulent and dynamic local environments of FRBs.
FRB 20240619D is a repeating FRB source discovered with MeerKAT in 2024. Within hours of its publication, we initiated a high-cadence monitoring campaign as part of the ECLAT and HYPERFLASH programs, utilizing multiple radio telescopes across Europe. The participating stations included Westerbork, Dwingeloo, Stockert, and Nançay. Over several months, we accumulated more than 500 hours of on-source observations, detecting hundreds of bursts, including an exceptionally bright burst with a signal-to-noise ratio exceeding 6000.
Using very-high-time-resolution data (1 μs), we found significant variations in the dispersion measure between bursts, a behavior not typically observed so far in other repeating FRBs or Galactic pulsars. Additionally, we identified sub-burst structures exhibiting residual time-frequency sweeps even after correcting for dispersion. These intra-burst sweeps may provide new insights for mapping the FRB’s emitting region and understanding its emission mechanisms.
| Talk category | NOVA Network 3 |
|---|---|
| Preference for a talk or poster | Talk |
| Talk preference for PhD students | 3rd year PhD candidate, but I have given a talk before |
