Nondetection of CHIME/Fast Radio Burst Sources with the Arecibo Observatory

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