Non-detection of CHIME/FRB sources with the Arecibo Observatory

TL;DR

This study conducted follow-up observations of known FRBs with Arecibo, finding no additional bursts and setting upper limits on their repetition rates, which are lower than those of some well-known repeaters, indicating possible diverse FRB populations.

Contribution

The paper provides new constraints on FRB repetition rates using Arecibo follow-up observations, highlighting the potential existence of a low-repetition sub-population.

Findings

No additional bursts detected from the nine sources.

Repetition rate upper limits are between 0.01 and 0.1 hr^{-1}.

Repetition rates are lower than those of some famous repeating FRBs.

Abstract

In this work, we present follow-up observations of two known repeating fast radio bursts (FRBs) and seven non-repeating FRBs with complex morphology discovered with CHIME/FRB. These observations were conducted with the Arecibo Observatory 327 MHz receiver. We detected no additional bursts from these sources, nor did CHIME/FRB detect any additional bursts from these sources during our follow-up program. Based on these non-detections, we provide constraints on the repetition rate, for all nine sources. We calculate repetition rates above 1 Jy using both a Poisson distribution of repetition and the Weibull distribution of repetition presented by Oppermann et al. (2018). For both distributions, we find repetition upper limits of the order $\lambda = 10^{-2} - 10^{-1} \text{hr}^{-1}$ for all sources. These rates are much lower than those recently published for notable repeating FRBs like FRB 20121102A and FRB 20201124A, suggesting the possibility of a low-repetition sub-population.