FRTSearch reframes fast radio transient detection as instance segmentation on dynamic spectra and uses the segmented shapes to infer dispersion measure and time of arrival, achieving 98% recall with over 99.9% fewer false positives than traditional methods.
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Simulations indicate HI absorption in FRB spectra is detectable when scintillation decorrelation bandwidth differs markedly from absorption width, with ≳1000 stacked bursts needed at current sensitivities.
Population-level statistical test on repeating FRB DM evolution finds decreasing trends more common than increasing (p=0.033), consistent with young SNR expansion reducing local electron density.
FRB 20220912A shows bimodal burst intervals, a 2.3-sigma DM rise of 1.4 pc cm^{-3} yr^{-1}, no RM trend, and possibly unique local environment compared to other repeaters.