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astro-ph.HE · High Energy Astrophysical Phenomenaastro-ph.IM · Instrumentation and Methods for Astrophysics

The mean squared circular polarization fraction difference in 54 close FRB 20201124A pairs is 45% below a ten-minute shuffle mean

We tested listed circular polarization fractions in the April–May 2021 FAST catalog for FRB 20201124A. We selected 54 adjacent pairs with gaps at most 0.3 seconds and at least four measured values in each fixed ten-minute bin. Their mean squared difference is 0.01502. The exact mean under exchange of values within bins is 0.02755. The ratio is 0.545, with a descriptive 95% day bootstrap interval of 0.317–0.853. In 99,999 shuffles, the one-sided p-value is 0.0086. An added ordered day-rotation control gives a ratio of 0.601 and p = 0.043. All tested bin choices give ratios below one, but some p-values exceed 0.05. All listed fractions are nonnegative. An initial plan error about signed values was corrected, and the final question is exploratory. The result measures a catalog association under stated exchange rules. It does not establish polarization handedness, a shared emission state, or a physical mechanism. The package preserves source data, provenance, code, plans, full results, and figures. An independent exact arithmetic check and a full offline rerun verify the calculations.

fast radio bursts · FRB 20201124A · FAST · circular polarization · burst pairs · permutation test · reproducible research

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References

9
  1. usesdoi:10.1038/s41586-022-05071-8

    This article defines the original FAST events and polarization measurements. We test listed values from its April–May 2021 catalog.

  2. usesdoi:10.6084/m9.figshare.19688845.v1

    We downloaded this fixed CC BY 4.0 data version from Figshare and preserve its original files and source records.

  3. A day reflection test did not detect a short gap time direction in two FAST burst catalogs sci:sha256:f6bcc6b1c995944b601dafe60b7a696cf7fadf3612cb6dabc829341ed50f3a41

    This related study tested arrival-time direction in the same Xu catalog. We use it for context. We wrote new code and downloaded the data separately.

  4. doi:10.1093/mnras/stad2532

    This prior work measures burst pair timing and discusses an aftershock model. It gives context for short-gap tests.

  5. doi:10.3847/2041-8213/adc10b

    This prior work tests time-frequency direction in close burst pairs. Our main statistic uses polarization amount and is unchanged by pair reversal.

  6. doi:10.1093/nsr/nwae293

    This prior work reports high circular polarization and rapid changes in the separate September 2021 campaign. We do not claim the first observation of rapid polarization change.

  7. doi:10.48550/arXiv.2408.04401

    This paper discusses propagation effects and rapid polarization changes. Our table test cannot select an emission or propagation mechanism.

  8. doi:10.1093/mnras/stab2936

    This earlier Effelsberg study reports burst polarization properties for the same source.

  9. doi:10.1093/mnras/stac683

    This earlier ASKAP and Parkes study reports circular polarization and varied burst properties for the same source.

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