# GBTrans: A commensal search for radio pulses with the Green Bank twenty metre telescope

## TL;DR

GBTrans is a real-time system using the Green Bank 20-m telescope to search for fast radio bursts, detecting known pulsars but no new FRBs over 503 days, and constraining the FRB fluence distribution.

## Contribution

This paper introduces GBTrans, a novel real-time FRB search system operating with a small radio telescope, and provides constraints on the FRB fluence distribution.

## Key findings

- Detected pulses from four known pulsars.
- No new FRBs detected in 503 days.
- Constrained the FRB fluence index to less than 2.5.

## Abstract

We describe GBTrans, a real-time search system designed to find fast radio bursts (FRBs) using the 20-m radio telescope at the Green Bank Observatory. The telescope has been part of the Skynet educational program since 2015. We give details of the observing system and report on the non-detection of FRBs from a total observing time of 503 days. Single pulses from four known pulsars were detected as part of the commensal observing. The system is sensitive enough to detect approximately half of all currently known FRBs and we estimate that our survey probed redshifts out to about 0.3 corresponding to an effective survey volume of around 124,000~Mpc$^3$. Modeling the FRB rate as a function of fluence, $F$, as a power law with $F^{-\alpha}$, we constrain the index $\alpha < 2.5$ at the 90% confidence level. We discuss the implications of this result in the context of constraints from other FRB surveys.