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Microstructure of the nanosecond burst

Determine whether the dedispersed burst from the Relay 2 satellite detected with the ASKAP/CRACO system consists of a sequence of pulses of decreasing amplitude or a single pulse exhibiting an oscillating exponential decay, given the 3 ns time resolution used in the analysis.

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Background

After coherent dedispersion at a dispersion measure consistent with a single ionospheric pass, the authors resolved the burst into a primary impulse of approximately 10 ns followed by lower-intensity structure lasting about 30 ns. Due to the 3 ns time resolution of the Nyquist-sampled data, they cannot resolve whether the post-peak structure is composed of multiple sub-pulses or is a single pulse with oscillatory decay.

References

The burst, plotted in Figure~\ref{fig:nanosecond}, consists of a primary impulse of $10$\ duration, with subsequent lower-intensity structure of total duration $30$\ (given our time resolution of 3\,ns, we cannot distinguish between a sequence of pulses of decreasing amplitude, versus a single pulse with an oscillating exponential decay).

— A nanosecond-duration radio pulse originating from the defunct Relay 2 satellite (2506.11462 - James et al., 13 Jun 2025) in Section 2.1 (Event properties)