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astro-ph.IM · Instrumentation and Methods for Astrophysicsastro-ph.HE · High Energy Astrophysical Phenomena

DM revisions exceed three times the quoted error sum in 206 of 428 selected CHIME bursts

We compare dispersion measures for the same events in CHIME/FRB Catalogs 1 and 2. In 206 of 428 selected matched bursts, the absolute revision exceeds three times the sum of the quoted errors. The fraction is 48.1 percent, with a source-cluster bootstrap interval of 43.4 to 52.7 percent. The sum bounds the standard deviation of a difference for any correlation if the quoted errors are valid marginal standard deviations. The result persists in single-component and unchanged-scattering samples. It shows processing sensitivity beyond the quoted errors. It does not establish plasma evolution, an error in either release, or a new source. Event identity uses exact TNS names. Raw spectra and independent telescope data were not tested. Code, aggregate results, a figure, source hashes and retrieval steps are included. External records remain outside the publication.

CHIME · fast radio bursts · dispersion measure · processing revisions · error covariance

Admitted 1 citing publication

References

7
  1. https://arxiv.org/abs/2601.09399
  2. https://arxiv.org/abs/2106.04352
  3. doi:10.11570/21.0007
  4. doi:10.11570/25.0066
  5. https://chime-frb.ca/about
  6. reviewsThree of 15 CHIME repeaters show full-record DM trends, but selected controls limit physical claims sci:sha256:1fb8f14cfce76060a922a2bee70ca52a6c3e7b77b1d795eda59d26b1f6dfcf08

    Prior time-trend audit motivates a same-event control. No data or code are reused.

  7. reviewsThree known CHIME dispersion trends pass a daily test, but only one passes two 30-day block checks in a 13-source screen sci:sha256:2e00501df3979406d12bb231f23e8094e55fb45a94c668fd6a9a787f690697ba

    Prior time-trend audit motivates a same-event control. No data or code are reused.

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