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arXiv · 2601.09399

The Second CHIME/FRB Catalog of Fast Radio Bursts

FRB Collaboration·Thomas Abbott·Bridget C. Andersen·Shion Andrew·Kevin Bandura·Mohit Bhardwaj·Yash Bhusare·Charanjot Brar·Tomas Cassanelli·Shami Chatterjee·Jean-Francois Cliche·Amanda M. Cook·Alice Curtin·Matt Dobbs·Fengqiu Adam Dong·Gwendolyn Eadie·Tarraneh Eftekhari·Emmanuel Fonseca·B. M. Gaensler·Deborah Good·Mark Halpern·Jason W. T. Hessels·Adaeze Ibik·Naman Jain·Ronniy C. Joseph·Zarif Kader·Victoria M. Kaspi·Afrokk Khan·Bikash Kharel·Ajay Kumar·T. L. Landecker·Dustin Lang·Adam E. Lanman·Magnus L'Argent·Mattias Lazda·Calvin Leung·Dong Zi Li·Chris J. Lintott·Robert Main·Kiyoshi W. Masui·Sujay Mate·Kyle McGregor·Ryan Mckinven·Juan Mena-Parra·Bradley W. Meyers·Daniele Michilli·Cherry Ng·Mason Ng·Kenzie Nimmo·Gavin Noble·Ayush Pandhi·Swarali S. Patil·Aaron B. Pearlman·Ue-Li Pen·Ziggy Pleunis·J. Xavier Prochaska·Masoud Rafiei-Ravandi·Scott Ransom·Andre Renard·Mawson W. Sammons·Ketan R. Sand·Paul Scholz·Vishwangi Shah·Kaitlyn Shin·Seth R. Siegel·Sloane Sirota·Kendrick Smith·Ingrid Stairs·David C. Stenning·Shriharsh P. Tendulkar·Keith Vanderlinde·Mike Walmsley·Haochen Wang·Dallas Wulf
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Abstract

We present a catalog of 4539 fast radio bursts (FRBs) observed with the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope between 25 July 2018 and 15 September 2023. These bursts originate from 3641 unique sources, including 981 bursts from 83 known repeating sources. For each FRB, the catalog provides a $O(10')$ estimate of sky location along with corresponding measurements of cumulative exposure time and survey sensitivity over the observing period. It includes a total-intensity dynamic spectrum between 400 and 800 MHz at 0.983 ms resolution. From this spectrum, we constrain a model of the burst morphology and measure key parameters such as arrival time, intrinsic temporal width, dispersion measure, scattering time, and flux density. This second catalog includes all FRBs from the first catalog, with every event reprocessed using a uniform and improved analysis framework. We show that previously published inferences remain valid under the updated measurements. We assess consistency of the detection rate across observational parameters, present initial distributions of burst properties, and outline ongoing and future studies that will use this catalog to investigate the nature of FRBs and their utility as astrophysical and cosmological probes.

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FRB Collaboration, Thomas Abbott, Bridget C. Andersen, Shion Andrew, Kevin Bandura, Mohit Bhardwaj, Yash Bhusare, Charanjot Brar, Tomas Cassanelli, Shami Chatterjee, Jean-Francois Cliche, Amanda M. Cook, Alice Curtin, Matt Dobbs, Fengqiu Adam Dong, Gwendolyn Eadie, Tarraneh Eftekhari, Emmanuel Fonseca, B. M. Gaensler, Deborah Good, Mark Halpern, Jason W. T. Hessels, Adaeze Ibik, Naman Jain, Ronniy C. Joseph, Zarif Kader, Victoria M. Kaspi, Afrokk Khan, Bikash Kharel, Ajay Kumar, T. L. Landecker, Dustin Lang, Adam E. Lanman, Magnus L'Argent, Mattias Lazda, Calvin Leung, Dong Zi Li, Chris J. Lintott, Robert Main, Kiyoshi W. Masui, Sujay Mate, Kyle McGregor, Ryan Mckinven, Juan Mena-Parra, Bradley W. Meyers, Daniele Michilli, Cherry Ng, Mason Ng, Kenzie Nimmo, Gavin Noble, Ayush Pandhi, Swarali S. Patil, Aaron B. Pearlman, Ue-Li Pen, Ziggy Pleunis, J. Xavier Prochaska, Masoud Rafiei-Ravandi, Scott Ransom, Andre Renard, Mawson W. Sammons, Ketan R. Sand, Paul Scholz, Vishwangi Shah, Kaitlyn Shin, Seth R. Siegel, Sloane Sirota, Kendrick Smith, Ingrid Stairs, David C. Stenning, Shriharsh P. Tendulkar, Keith Vanderlinde, Mike Walmsley, Haochen Wang, Dallas Wulf. 2026-01-14. The Second CHIME/FRB Catalog of Fast Radio Bursts. https://arxiv.org/abs/2601.09399

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