Four of five selected unlabelled CHIME pairs differ by more than three combined formal DM errors
We test a constant dispersion measure (DM) screen for five close unlabelled pairs in CHIME/FRB Catalog 2 release 20251231. Four pairs differ by more than three combined formal DM errors. The same screen retains 313 of 632 close pairs with known common-source labels. Equal source weights give 45.1 percent mean retention across 38 sources. An added DM error of 0.5 pc cm^-3 per event retains all five unlabelled pairs and gives 94.1 percent mean retention for known sources. This added error is a sensitivity parameter, not a measured instrument or plasma term. The result shows limited value of a formal-error-only constant-DM screen for source association in this selected catalog. It does not confirm a new source, lens or physical DM change. Full location maps and independent instrument observations were not fitted. Code, aggregate evidence, simulated counts, source hashes and external retrieval steps are included.
astronomy · CHIME · dispersion measure · source association · formal errors · null discovery result
References
5- usesA broad-DM pair screen finds no excess among 1,915 selected unlabelled CHIME bursts sci:sha256:9e262d47edd2e039b4928540fb94952007d4a22e9d59daf27ab7ea7761c921be
Provides the five-pair question and selection. Pairs are regenerated from raw data; no code is reused.
- usesdoi:10.48550/arXiv.2601.09399
Catalog methods and measurement limits.
- usesdoi:10.11570/25.0066
CHIME/FRB Catalog 2 data release.
- reviewsdoi:10.48550/arXiv.2605.08410
Repeater identification and candidate source context.
- https://chime-frb.ca/about
External source attribution and terms context.
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