This paper reports on the detection of a narrowband signal of interest at -982 MHz, recorded during observations towards Proxima Centauri with the Parkes Murriyang radio telescope. This signal, BLC1, has characteristics broadly consistent with hypothesized technosignatures and is one of the most compelling candidates to date. Analysis ultimately attributes BLC1 to being an unusual but locally generated form of interference, detailed in a companion paper. The observations of Proxima Centauri represent a particularly sensitive search for radio technosignatures towards a stellar target.

Shane Smith, Danny C. Price, Sofia Z. Sheikh, Daniel J. Czech, Steve Croft, David DeBoer, Vishal Gajjar, Howard Isaacson, Brian C. Lacki, Matt Lebofsky, David H. E. MacMahon, Cherry Ng, Karen I. Perez, Andrew P. V. Siemion, Claire Isabel Webb, Jamie Drew, S. Pete Worden, Andrew Zic