# A Fast Radio Burst with frequency-dependent polarization detected during Breakthrough Listen observations

## TL;DR

This paper reports the first detection of a non-repeating Fast Radio Burst with full polarization data, revealing complex frequency-dependent polarization structure, and discusses its likely astrophysical origin amidst potential interference.

## Contribution

It presents the first full-polarization voltage data capture for a non-repeating FRB, enabling detailed polarization analysis and verification of its astrophysical nature.

## Key findings

- Detected complex polarized frequency structure in FRB 180301
- First to capture full-polarization voltage data for a non-repeating FRB
- Likely of astrophysical origin, but interference cannot be ruled out

## Abstract

Here, we report on the detection and verification of Fast Radio Burst FRB 180301, which occurred on UTC 2018 March 1 during the Breakthrough Listen observations with the Parkes telescope. Full-polarization voltage data of the detection were captured--a first for non-repeating FRBs--allowing for coherent de-dispersion and additional verification tests. The coherently de-dispersed dynamic spectrum of FRB 180301 shows complex, polarized frequency structure over a small fractional bandwidth. As FRB 180301 was detected close to the geosynchronous satellite band during a time of known 1-2 GHz satellite transmissions, we consider whether the burst was due to radio interference emitted or reflected from an orbiting object. Based on the preponderance of our verification tests, we find that FRB 180301 is likely of astrophysical origin, but caution that anthropogenic sources cannot conclusively be ruled out.