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 λ=10−2−10−1hr−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.
@article{arxiv.2204.09090,
title = {Non-detection of CHIME/FRB sources with the Arecibo Observatory},
author = {Deborah C. Good and Pragya Chawla and Emmanuel Fonseca and Victoria Kaspi and B. W. Meyers and Ziggy Pleunis and Ketan R. Sand and Paul Scholz and I. H. Stairs and Shriharsh P. Tendulkar},
journal= {arXiv preprint arXiv:2204.09090},
year = {2023}
}