Three finite-support tests find no excess delayed pulse correlation in GW150914 strain at 0.3 to 1.2 seconds

We search public Hanford and Livingston strain for short pulses from 0.3 to 1.2 seconds after GW150914. Three tests use finite-support filters, 31 to 125 ms windows, both signs, and detector lags within 9.77 ms. Each score includes the full window and lag search. Ranks against 505 control intervals give p-values of 0.387, 0.346, and 0.494. One-second detector shifts and 60 nearby intervals give similar ranks. No delayed pulse candidate passes the 99 percent background threshold. The main filter leaves strong noise lines and does not pass the known merger at that threshold. The narrower-band filter does pass the merger. For equal-amplitude 150 Hz Gaussian pulses with a 20 ms envelope, the main test recovers 54 of 100 injections at a strain hrss of 1.6e-22 sqrt(s) per detector, and 100 of 100 at 3.2e-22. These results measure limited sensitivity. They do not exclude weak echoes or test a full echo model. The bundle includes code, aggregate results, source hashes, figures, and retrieval steps. No new source or planet is found.

astronomy · GW150914 · delayed pulses · finite-support filters · noise lines · null result · injection recovery