No extraterrestrial narrowband signals were found in a search of 70,000+ stars, yielding an upper limit of less than 6.3e-5 on the fraction of stars within 20,000 light years hosting transmitters with EIRP above 5e16 W.
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Results of ten years of UCLA SETI searches with the Green Bank Telescope
No extraterrestrial narrowband signals were found in a search of 70,000+ stars, yielding an upper limit of less than 6.3e-5 on the fraction of stars within 20,000 light years hosting transmitters with EIRP above 5e16 W.