Discovery of 30 Repeating Fast Radio Burst Sources and Uniform Population Statistics of 80 Repeating Sources from CHIME/FRB

Amanda M. Cook; Kaitlyn Shin; Ziggy Pleunis; Maxwell Fine; Naman Jain; Derek Bingham; Alice P. Curtin; Gwendolyn Eadie; B. M. Gaensler; Jason W. T. Hessels; Calvin Leung; Robert Main; Nicole Mulyk; Ayush Pandhi; Paul Scholz; Seth R. Siegel; David C. Stenning; Thomas C. Abbott; Bridget C. Andersen; Mohit Bhardwaj; Alice Cai; Shami Chatterjee; Fengqiu Adam Dong; Emmanuel Fonseca; Danté M. Hewitt; Ronniy C. Joseph; Lordrick Kahinga; Mattias Lazda; Victoria M. Kaspi; Afrokk Khan; Bikash Kharel; Lluis Mas-Ribas; Kiyoshi W. Masui; Kyle McGregor; Daniele Michilli; Ryan Mckinven; Mason Ng; Kenzie Nimmo; Swarali Shivraj Patil; Aaron B. Pearlman; Mawson W. Sammons; Ketan R. Sand; Aylar Sedaei Oghani; Vishwangi Shah; Kendrick Smith; Ingrid Stairs; Tarik J. Zegmott

arXiv · 2605.08410

Discovery of 30 Repeating Fast Radio Burst Sources and Uniform Population Statistics of 80 Repeating Sources from CHIME/FRB

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Abstract

We present 30 newly discovered repeating fast radio burst (FRB) sources from the second catalog of bursts detected by the FRB backend on the Canadian Hydrogen Intensity Mapping Experiment (CHIME/FRB). These repeaters have extragalactic dispersion measures (DMs) spanning $99.4-1446.0\ \text{pc cm}^{-3}$ and burst rates between $10^{-5.7}$ and $10^{-0.5}$ hr$^{-1}$ scaled to a fluence threshold of 5 Jy ms. We report evidence of monotonic, linear DM variations in four repeaters on years-long timescales. The newly discovered sources bring CHIME/FRB's total number of observed repeating FRBs to 80, 79 of which were discovered by CHIME/FRB, between 2018 July 25 and 2023 September 15. In the full CHIME/FRB sample, only 2.4$\pm 0.4\%$ of sources have been observed to repeat, and we do not find evidence for significant evolution of this value over the duration of the experiment. We find no substantial evidence for bimodal populations of one-off and repeating FRBs in their burst rate distributions; the distribution of upper limits on repeat rates implied from observations of as-yet one-offs is entirely contained within the observed range of repeater burst rates and the distributions do not appear inconsistent. Similarly, using the population analysis framework of C. W. James (2023), we find that our observations of repeating and yet-one-off FRBs are equally well fit assuming a power-law distribution of repeat rates with 50$-$100% of the population repeating.

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Amanda M. Cook, Kaitlyn Shin, Ziggy Pleunis, Maxwell Fine, Naman Jain, Derek Bingham, Alice P. Curtin, Gwendolyn Eadie, B. M. Gaensler, Jason W. T. Hessels, Calvin Leung, Robert Main, Nicole Mulyk, Ayush Pandhi, Paul Scholz, Seth R. Siegel, David C. Stenning, Thomas C. Abbott, Bridget C. Andersen, Mohit Bhardwaj, Alice Cai, Shami Chatterjee, Fengqiu Adam Dong, Emmanuel Fonseca, Danté M. Hewitt, Ronniy C. Joseph, Lordrick Kahinga, Mattias Lazda, Victoria M. Kaspi, Afrokk Khan, Bikash Kharel, Lluis Mas-Ribas, Kiyoshi W. Masui, Kyle McGregor, Daniele Michilli, Ryan Mckinven, Mason Ng, Kenzie Nimmo, Swarali Shivraj Patil, Aaron B. Pearlman, Mawson W. Sammons, Ketan R. Sand, Aylar Sedaei Oghani, Vishwangi Shah, Kendrick Smith, Ingrid Stairs, Tarik J. Zegmott. 2026-05-08. Discovery of 30 Repeating Fast Radio Burst Sources and Uniform Population Statistics of 80 Repeating Sources from CHIME/FRB. https://arxiv.org/abs/2605.08410

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