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Breakthrough Listen (BL) is a ten-year initiative to search for signatures oftechnologically capable life beyond Earth via radio and optical observations ofthe local Universe. A core part of the BL program is a comprehensive survey of1702 nearby stars at radio wavelengths (1-10 GHz). Here, we report onobservations with the 64-m CSIRO Parkes radio telescope in New South Wales,Australia, and the 100-m Robert C. Byrd Green Bank radio telescope in WestVirginia, USA. Over 2016 January to 2019 March, a sample of 1138 stars wasobserved at Green Bank using the 1.10-1.90 GHz and 1.80-2.80 GHz receivers, and189 stars were observed with Parkes over 2.60-3.45 GHz. We searched these datafor the presence of engineered signals with Doppler-acceleration drift ratesbetween -4 to 4 Hz/s. Here, we detail our data analysis techniques and provideexamples of detected events. After excluding events with characteristicsconsistent with terrestrial radio interference, we are left with zerocandidates. Given the sensitivity of our observations, we can put an upperlimit on the power of potential radio transmitters at these frequencies at2x10^12 W, and 9x10^12 W for GBT and Parkes respectively. These observationsconstitute the most comprehensive search over 1.10-3.45 GHz fortechnosignatures to date. All data products, totalling ~219 TB, are availablefor download as part of the first BL data release (DR1), as described in acompanion paper (Lebofsky et. al., 2019)

The Breakthrough Listen Search for Intelligent Life: Observations of 1327 Nearby Stars over 1.10-3.45 GHz