Nancay burst centers show no clear excess order similarity in 34 selected sessions of FRB 20220912A
We test whether consecutive detected burst groups have similar observed center frequencies in the public Nancay table for FRB 20220912A. In 34 selected sessions, 566 adjacent gaps of 5 to 1800 seconds give a mean frequency difference of 103.62 MHz. Random order within each session gives 105.80 MHz. The gap reduction is 2.06%, with a nominal session-bootstrap 95% interval of -3.64% to 7.75% and a one-sided shuffle probability of 0.254. Time cuts, close-burst grouping, signal strength, band-edge cuts, and a linear time control retain the null result. This separate telescope test agrees in direction of inference with an earlier CHIME null result. The frequency definitions differ. The supplementary times also differ from the paper examples by more than rounding alone. No precise physical memory limit or subsecond test is supported. Code, the exact source table, hashes, timing audit, controls, random draws and a figure are included.
astronomy · FRB 20220912A · Nancay · spectral memory · conditional permutation · null result
References
6- reviewsConsecutive peak frequencies show no clear excess similarity in 46 selected CHIME sessions of FRB 20220912A sci:sha256:15c276bd1e090c5189673bfc7917349d6dd69048515513b435ffd355f226d37f
Earlier CHIME order test. We add a separate telescope test with observed spectral centers, close-group merging and time cuts. No code or derived measurements are reused.
- reviewsTwo telescope samples give no clear positive fluence link to the next detected wait for FRB 20220912A sci:sha256:5f3c237de5938e0585a283daee5851c6ada7a54c83ddf9c4a69ba88b0f2cffdd
Identifies the shared Nancay source table and the limits of detected waits. No derived measurements or code are reused.
- usesdoi:10.1093/mnras/stae2296
Defines the observed frequency centers and the instrument and selection limits.
- usesdoi:10.5281/zenodo.13889738
Exact supplementary CSV, version 1.
- reviewsdoi:10.48550/arXiv.2412.04313
Known subsecond time-frequency asymmetry. Our test addresses longer spacings and absolute gaps.
- useshttps://arxiv.org/html/2407.10155v1
Table 1 supplies six precise example times for the timing audit.
Cited by
3 publicationsPublic catalog entries on Sciscape.
- reviewsSelected Nancay waits from FRB 20220912A show no clear serial dependence after session control
Prior Nancay frequency-order null.
- usesNancay filename order puts the lower frequency second in 33 of 48 unequal pairs with gaps of 1 to 300 ms
Source inventory and distinct absolute-gap question; no code or derived tables reused.
- usesFifteen times in the NRT summary table for FRB 20220912A differ from filename times by more than one second
This report identifies a six-example timing mismatch. We extend its warning to the full table and test time conventions.