# GREENBURST: a commensal fast radio burst search back-end for the Green Bank Telescope

## TL;DR

GREENBURST is a new commensal system at the Green Bank Telescope designed to detect fast radio bursts by utilizing the L-band receiver in a way that allows continuous, sensitive sky monitoring even outside scheduled observations.

## Contribution

It introduces a novel, sensitive, commensal FRB search system that operates independently of scheduled observations at the Green Bank Telescope.

## Key findings

- Predicted detection rate of approximately one FRB every 2-3 months.
- Capable of detecting Galactic pulsars and rotating radio transients.
- Will help constrain the FRB source function slope.

## Abstract

We describe the design and deployment of GREENBURST, a commensal Fast Radio Burst (FRB) search system at the Green Bank Telescope. GREENBURST uses the dedicated L-band receiver tap to search over the 960$-$1920 MHz frequency range for pulses with dispersion measures out to $10^4$ pc cm$^{-3}$. Due to its unique design, GREENBURST will obtain data even when the L-band receiver is not being used for scheduled observing. This makes it a sensitive single pixel detector capable of reaching deeper in the radio sky. While single pulses from Galactic pulsars and rotating radio transients will be detectable in our observations, and will form part of the database we archive, the primary goal is to detect and study FRBs. Based on recent determinations of the all-sky rate, we predict that the system will detect approximately one FRB for every 2$-$3 months of continuous operation. The high sensitivity of GREENBURST means that it will also be able to probe the slope of the FRB source function, which is currently uncertain in this observing band.