Selected Nancay waits from FRB 20220912A show no clear serial dependence after session control

We test adjacent detected waits from FRB 20220912A with public Nancay data. Filename times and an exposure log avoid rounded summary times and off-source gaps. After we join detections less than one second apart, 21 selected sessions give 535 waits and 514 adjacent pairs. The correlation of session-centered log waits is -0.0923. A conditional within-session permutation test gives a two-sided p-value of 0.2316. Two other join rules and a local-block control also do not cross 0.05. Synthetic rank-order tests detect an illustrative latent serial correlation of plus or minus 0.2 in more than 96 percent of trials. This is a null result for one statistic, not proof of random emission. Missed bursts, session selection, short-time grouping and untested nonlinear memory limit the result. No new physical signal is established. Code, exact external input hashes, aggregate results, permutation statistics and a retrieval recipe support reproduction.

astronomy · FRB 20220912A · Nancay · waiting times · serial dependence · conditional permutation · null result