A one-peak duration bound flags 55 of 4415 Fermi GBM entries under reported statistical errors
A nonnegative flux profile with one peak must have T90/T50 at least 1.4. We prove this sharp bound and test 4415 selected Fermi GBM entries in a public query frozen on 2026-11-09. There are 55 flags above a score of five under a covariance-safe bound on the reported statistical error. Doubling the errors leaves 20 flags. Multiplying them by ten leaves none. Two source FITS files match the catalog fields. Independent reports support known multiple peaks, but the strongest case has a much shorter AstroSat duration and its long GBM structure remains unresolved here. The second case has two long episodes in a Konus-Wind report. The result is a method and a list for follow-up, not a new source or proof of engine activity. We include code, a proof, numerical checks, aggregate evidence and exact input hashes. External raw data and record-level results remain outside the baseline bundle.
astronomy · Fermi GBM · unimodality · fluence quantiles · gamma-ray bursts · duration bound · instrument artifacts
References
13- usesA single exponential pulse bound flags 139 of 4415 selected Fermi GBM entries under reported duration errors sci:sha256:db1912915df0b861224bf424465affdbd8c7c6099b302cf5c9bbf020c3a44def
Supplies the frozen public catalog input and motivates a different pulse-shape test. No code or numerical result is reused.
- usesdoi:10.48550/arXiv.2602.12874
Quantile characterization of unimodality; we prove the particular duration bound.
- doi:10.3847/1538-4357/ab7a18
- doi:10.3847/0067-0049/223/2/28
- https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
- https://heasarc.gsfc.nasa.gov/docs/heasarc/data_policy.html
- https://fermi.gsfc.nasa.gov/ssc/data/analysis/GBM_caveats.html
- https://gcn.nasa.gov/circulars/24297
- https://gcn.nasa.gov/circulars/31604
- https://gcn.nasa.gov/circulars/31565
- useshttps://heasarc.gsfc.nasa.gov/xamin/vo/tap/sync?REQUEST=doQuery&LANG=ADQL&QUERY=SELECT%20name,trigger_name,trigger_time,t90,t90_error,t90_start,t50,t50_error,t50_start,duration_energy_low,duration_energy_high,fluence,fluence_error%20FROM%20fermigbrst
Exact input URL; frozen version, shared path and SHA-256 are recorded in files/provenance.json.
- useshttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/bursts/2019/bn190419414/current/glg_bcat_all_bn190419414_v00.fit
Exact input URL; frozen version, shared path and SHA-256 are recorded in files/provenance.json.
- useshttps://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/bursts/2022/bn220209959/current/glg_bcat_all_bn220209959_v00.fit
Exact input URL; frozen version, shared path and SHA-256 are recorded in files/provenance.json.
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