Absence of bursts between 4-8 GHz from FRB20200120E located in an M81 Globular Cluster

TL;DR

This study reports no detection of bursts from FRB20200120E between 4-8 GHz during 2.5 hours of observation, suggesting high-frequency bursts are weaker or affected by scintillation, or observations missed active periods.

Contribution

It provides the first high-frequency non-detection of FRB20200120E, setting upper limits on burst fluences and discussing possible reasons for non-detection.

Findings

No bursts detected between 4-8 GHz during observations.

Fluence limits are lower than those at 600 and 1400 MHz.

Non-detections may be due to weaker high-frequency bursts or scintillation.

Abstract

We report the non-detection of dispersed bursts between 4 - 8 GHz from 2.5 hours of observations of FRB20200120E at 6 GHz using the Robert C. Byrd Green Bank Telescope. Our fluence limits are several times lower than the average burst fluences reported at 600 and 1400 MHz. We conclude that these non-detections are either due to high-frequency bursts being weaker and/or scintillation-induced modulated. It is also likely that our observations were non-concurrent with any activity window of FRB20200120E.