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At the end of March
the CHIME/FRB Collaboration
reported several repeat bursts from the repeating fast radio burst (FRB) source, FRB 20201124A.
Less than 10% of FRBs are repeaters, and so observations of this sub-class of events is
important in helping determine the origins and physical mechanisms behind these energeetic events.
ASKAP quickly followed up this report and
soon detected another FRB from this source,
as part of the Commensal Real-time ASKAP Fast Transients (CRAFT) survey science project.
The very strong burst, FRB 20210401A, was detected with a reported signal to noise ratio
of 64 in the incoherent sum of 24 antennas. ASKAP was operating with a central frequency
of 864.5 MHz, an observing bandwidth of 336 MHz, a time resolution of 1.2 ms and a frequency resolution of 1 MHz.
The measured dispersion measure was in agreement with that measured by CHIME.
The image above shows a "waterfall plot" of the burst after the observed dispersion
(a propagation effect which causes lower frequencies to arrive later) has been corrected for,
showing in the top panel the high signal-to-noise level detection, and in the bottom
panel that this FRB was strongest in the bottom portion of the ASKAP band.
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