Null Result for 3I/ATLAS Technosignature Search (1–9 GHz) with the Allen Telescope Array: EIRP Upper Limit of 10^-110 W

To the point

Researchers searched for radio technosignatures from the interstellar visitor 3I/ATLAS with the Allen Telescope Array across 1–9 GHz for about 7.25 hours, reduced millions of narrowband hits to 211 candidates that were visually inspected and found to be unworthy of follow-up, and set an upper limit on emitted power (EIRP) of roughly 10^(-110) W across the surveyed range, while applying Doppler drift corrections and noting a pipeline artifact that can produce a sawtooth pattern in drift rate.