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We present a framework for modeling astrophysical pulses from radio pulsarsand fast radio bursts (FRBs). This framework, called fitburst, generatessynthetic representations of dynamic spectra that are functions of severalphysical and heuristic parameters; the heuristic parameters can nonethelessaccommodate a vast range of distributions in spectral energy. fitburst isdesigned to optimize the modeling of features induced by effects that areintrinsic and extrinsic to the emission mechanism, including the magnitude andfrequency dependence of pulse dispersion and scatter-broadening. fitburstremoves intra-channel smearing through two-dimensional upsampling, and canaccount for phase wrapping of "folded" signals that are typically acquiredduring pulsar-timing observations. We demonstrate the effectiveness of fitburstin modeling data containing pulsars and FRBs observed with the CanadianHydrogen Intensity Mapping Experiment (CHIME) telescope.

Modeling the Morphology of Fast Radio Bursts and Radio Pulsars with fitburst