Apurba Bera (ICRAR/Curtin)

Abstract: Fast radio bursts (FRBs) are brilliant short-duration flashes of radio emission originating at cosmological distances. Vast diversity in the properties of currently known FRBs, complex spectro-temporal structures and the fleeting nature of these events make it difficult to understand their progenitors and emission mechanism. The Commensal Real-time ASKAP Fast Transients (CRAFT) survey, with the Australian Square Kilometre Array Pathfinder (ASKAP) radio telescope, enables high time resolution spectro-polarimetric study of FRBs that helps us probe the physics of the emission source and its surrounding medium. In the currently available CRAFT FRB sample we identified two apparently unrelated FRBs that show remarkable resemblance in pulse shape, rest-frame emission time-scales and polarization properties — which indicates that these two events are likely to have very similar progenitors. In this talk I will describe the observed properties of these two FRBs and discuss their possible interpretations.