[astro-ph.IM] Breakthrough Listen (BL), launched in July 2015 with a 10-year, $100M commitment from the Breakthrough Prize Foundation, is the most comprehensive search for technosignatures ever conducted.
This paper reviews the program’s first decade from the facilities and instrumentation perspective: the digital backends and data recorders, the signal-processing pipelines, the data archive, and the observatory partnerships that made the science possible. We organize the decade into three architectural eras.
In Generation 1 (2016–2019), BL deployed packetized raw-voltage wideband recorders on the 100-m Green Bank Telescope and the 64-m Parkes telescope, enabling targeted surveys of thousands of nearby stars across ∼0.7–8 GHz.
In a network-expansion phase (2020–2023), BL extended its instrumentation to partner facilities including the Sardinia Radio Telescope and international LOFAR stations, and developed verification frameworks that proved essential when the program’s highest-profile signal candidates emerged.
Since 2023, BL has operated in a fully commensal era: Ethernet-based, commodity-GPU backends riding on routine observatory operations: COSMIC at the Karl G. Jansky VLA, a revived Allen Telescope Array with deployed real-time deep-learning pipelines, and an autonomous multi-beam commensal survey at MeerKAT (BLUSE; >1.2 million pointings since mid-2022).
Over the decade, capturing data at ever higher rates forced a systematic approach to compression and archiving; the storage estate grew to ∼42 PB of capacity (∼31 PB in use) across seven systems on four continents by March 2026.
We conclude with engineering lessons (commodity hardware over bespoke hardware, open data as a first-class requirement, commensal science as backend validation, and verification frameworks built before they are needed) and with the outlook for SKA-era commensal technosignature science.
High-resolution spectra showing the main carrier and sidebands of the Voyager 1 (left) and Voyager 2 (right) telemetry downlinks as produced by the Breakthrough Listen systems at the Green Bank Telescope and Parkes, respectively. The Voyager spacecraft are the farthest human-made objects from Earth, making these faint signals of known origin a suitable end-to-end test of the BL signal chains. — [astro-ph.IM]
Comments: Keynote paper (Rudolf Pesek Lecture), 55th IAA Symposium on the Search for Extraterrestrial Intelligence (SETI), Session A4.1 “SETI Science and Technology”. Presented at the 77th International Astronautical Congress (IAC 2026), Antalya, Türkiye, 5-9 Oct 2026; to appear in the IAC proceedings. 11 pages, 2 figures, 2 tables
Subjects: Instrumentation and Methods for Astrophysics (astro-ph.IM)
Cite as: arXiv:2610.07482 [astro-ph.IM] (or arXiv:2610.07482v1 [astro-ph.IM] for this version)
David H.E. MacMahon, Daniel J Czech
https://doi.org/10.48550/arXiv.2610.07482
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Submission history
From: David MacMahon
[v1] Mon, 5 Oct 2026 22:47:14 UTC (1,112 KB)
https://arxiv.org/abs/2610.07482
Astrobiology, SETI,
