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

Amanda M. Cook (1; 2; and 3); Kaitlyn Shin (4); Ziggy Pleunis (3; 5); Maxwell Fine (1; 2); Naman Jain (1; 2); Derek Bingham (6); Alice P. Curtin (1; 2; and 3); Gwendolyn Eadie (7; 8; and 9); B. M. Gaensler (10; 11; and 7); Jason W. T. Hessels (1; 2; 3; and 5); Calvin Leung (12; 13); Robert Main (1; 2); Nicole Mulyk (1; 2); Ayush Pandhi (1; 2); Paul Scholz (14); Seth R. Siegel (15; 16; 1; and 2); David C. Stenning (6); Thomas C. Abbott (1; 2); Bridget C. Andersen (10); Mohit Bhardwaj (17); Alice Cai (18; 19); Shami Chatterjee (20); Fengqiu Adam Dong (14); Emmanuel Fonseca (21; 22); Dant\'e M. Hewitt (3); Ronniy C. Joseph (23); Lordrick Kahinga (10; 24); Mattias Lazda (7; 11); Victoria M. Kaspi (1; 2; and 25); Afrokk Khan (1; 2); Bikash Kharel (21; 22); Lluis Mas-Ribas (10); Kiyoshi W. Masui (26; 27); Kyle McGregor (1; 2); Daniele Michilli (28); Ryan Mckinven (1; 2); Mason Ng (1; 2); Kenzie Nimmo (19); Swarali Shivraj Patil (21; 22); Aaron B. Pearlman (26; 27; 1; and 2); Mawson W. Sammons (1; 2); Ketan R. Sand (1; 2); Aylar Sedaei Oghani (14); Vishwangi Shah (1; 2); Kendrick Smith (16); Ingrid Stairs (29); Tarik J. Zegmott (1; 2) ((1) Department of Physics; McGill University; Montr\'eal; QC; Canada; (2) Trottier Space Institute; McGill University; Montr\'eal; QC; Canada; (3) Anton Pannekoek Institute for Astronomy; University of Amsterdam; Amsterdam; The Netherlands; (4) Cahill Center for Astronomy; Astrophysics; California Institute of Technology; Pasadena; CA; USA; (5) ASTRON; Netherlands Institute for Radio Astronomy; Dwingeloo; The Netherlands; (6) Department of Statistics; Actuarial Science; Simon Fraser University; Burnaby; BC; Canada; (7) David A. Dunlap Department of Astronomy; Astrophysics; University of Toronto; Toronto; ON; Canada; (8) Department of Statistical Sciences; University of Toronto; Toronto; ON; Canada; (9) Data Sciences Institute; University of Toronto; Toronto; ON; Canada; (10) Department of Astronomy; Astrophysics; University of California; Santa Cruz; Santa Cruz; CA; USA; (11) Dunlap Institute for Astronomy; Astrophysics; University of Toronto; Toronto; ON; Canada; (12) Miller Institute for Basic Research; University of California; Berkeley; Berkeley; CA; USA; (13) Department of Astronomy; University of California; Berkeley; Berkeley; CA; USA; (14) Department of Physics; Astronomy; York University; Toronto; ON; Canada; (15) SKAO; Science Operations Centre; CSIRO ARRC; Kensington; WA; Australia; (16) Perimeter Institute for Theoretical Physics; Waterloo; ON; Canada; (17) Department of Space Planetary Astronomical Sciences; Engineering; Indian Institute of Technology Kanpur; Uttar Pradesh; India; (18) Department of Physics; Astronomy; Northwestern University; Evanston; IL; USA; (19) Center for Interdisciplinary Exploration; Research in Astronomy; Northwestern University; Evanston; IL; USA; (20) Cornell Center for Astrophysics; Planetary Science; Cornell University; Ithaca; NY; USA; (21) Department of Physics; Astronomy; West Virginia University; Morgantown; WV; USA; (22) Center for Gravitational Waves; Cosmology; West Virginia University; Morgantown; WV; USA; (23) S&T Netherlands; Delft; The Netherlands; (24) Department of Physics; College of Natural; Mathematical Sciences; University of Dodoma; Dodoma; Tanzania; (25) School of Physics; Astronomy; Tel Aviv University; Tel Aviv; Israel; (26) MIT Kavli Institute for Astrophysics; Space Research; MIT; Cambridge; MA; USA; (27) Department of Physics; MIT; Cambridge; MA; USA; (28) Laboratoire d'Astrophysique de Marseille; Aix-Marseille Univ.; CNRS; CNES; Marseille; France; (29) Department of Physics; Astronomy; University of British Columbia; Vancouver; BC; Canada)

arXiv:2605.08410·astro-ph.HE·May 12, 2026

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

Amanda M. Cook (1, 2, and 3), Kaitlyn Shin (4), Ziggy Pleunis (3, 5), Maxwell Fine (1, 2), Naman Jain (1, 2), Derek Bingham (6), Alice P. Curtin (1, 2, and 3), Gwendolyn Eadie (7, 8, and 9), B. M. Gaensler (10, 11, and 7), Jason W. T. Hessels (1, 2, 3, and 5), Calvin Leung (12

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TL;DR

This paper reports the discovery of 30 new repeating fast radio burst sources by CHIME/FRB, analyzes their properties, and finds that the population of repeaters and non-repeaters may be similar in their burst rate distributions.

Contribution

The study presents 30 new repeating FRB sources, expands the total to 80, and provides a population analysis suggesting similar burst rate distributions for repeaters and non-repeaters.

Findings

01

30 new repeating FRB sources discovered by CHIME/FRB.

02

Evidence of linear DM variations in four repeaters over years.

03

No significant difference in burst rate distributions between repeaters and non-repeaters.

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 $99.4 - 1446.0 pc cm^{- 3}$ and burst rates between $1 0^{- 5.7}$ and $1 0^{- 0.5}$ 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…

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