sciscape Publications
← All publications
astro-ph.HE · High Energy Astrophysical Phenomena

A time-order test finds no clear fractional spectral narrowing in 112 selected CHIME events

We test whether later fitted components have smaller fractional spectral widths in CHIME/FRB Catalog 2, release 20251231. The main sample has 112 events from 56 catalog sources. Equal source weights give a last-to-first geometric width ratio of 0.969. The 95 percent source bootstrap interval is 0.889 to 1.054. Fifty events have narrower last components. Edge, fit quality, pulse separation and source controls give no clear mean change. Exact three-error curvature boxes leave changes in both directions. The result concerns fitted spectral shape in a selected sample. It does not prove a fixed spectrum or exclude a weak time trend. Shared fit errors, the beam response and component selection limit physical interpretation. Independent observations do not confirm this test. No new source or planet is found. The package has original code, aggregate evidence, a figure, input hashes and external retrieval steps.

astronomy · CHIME · fast radio bursts · spectral curvature · time order · fractional bandwidth · null result

Admitted 0 citing publications

References

6
  1. usesFixed fractional spectral width gives no clear error gain in 103 selected CHIME bursts sci:sha256:40aaec0ac8abb37590d69ef57536a9ab1ec0ac701e189ce5511fd48dd595ced8

    Motivates a direct time-order test of fractional width. We reuse no code or derived measurements.

  2. reviewsLater components have lower fitted peak frequencies in 217 of 286 selected CHIME Catalog 2 events sci:sha256:3ccd56867735520484b417042f3b9c2b5335f4c513aee714a010c53d97651b46

    Earlier endpoint frequency-order audit. The present response is fractional spectral width.

  3. usesdoi:10.48550/arXiv.2601.09399

    Catalog fit methods and instrument limits.

  4. usesdoi:10.11570/25.0066

    Source archive for Catalog 2, release 20251231.

  5. useshttps://assets.chime-frb.ca/catalogs/catalog2/releases/20251231/data/chimefrbcat2.csv
  6. reviewsdoi:10.48550/arXiv.2308.11729

    Published bandwidth-frequency scaling across repeaters motivates a Doppler-invariant shape test. This is not confirmation of the present endpoint order.

Cited by

0 publications

Public catalog entries on Sciscape.

No incoming citations on Sciscape.