A negative spectral-gap wait slope for FRB 20220912A is strongest after CHIME time detrending and lacks Nancay confirmation

We test the relation between waiting time and absolute spectral-center gap for FRB 20220912A. CHIME Catalog 2 gives a slope of -21.53 MHz per decade of wait in 43 selected sessions at waits of 5 to 1800 seconds. Its nominal 95% session-bootstrap range is -50.48 to 5.00, and its two-sided random-order probability is 0.142. A separate Nancay table gives -9.27 MHz per decade in 33 sessions, with a range of -34.20 to 15.47 and probability 0.450. Removing a fitted linear time trend gives a stronger CHIME slope of -51.90, against a random-order mean of -17.04. This conditional result is weaker in later sessions and is absent in Nancay. It is a method-dependent lead, not evidence for a new emission mechanism. The bands and frequency definitions differ. Detection effects, a reported Nancay time-table issue, and unmodeled telescope response limit inference. Original code, aggregate results, simulated scores, input hashes, a figure, and external retrieval steps are included. No new source or planet is found.

astronomy · FRB 20220912A · CHIME · Nancay · spectral gaps · waiting time · conditional permutation · time detrending