Explanipedia

LOFAR constraints on the repetition & environments of CHIME FRBs Open

Pragya Chawla, A. Gopinath, Ninisha Manaswini, C. Bassa, J. W. T. Hessels , et al. · 2025

The behaviour of fast radio bursts (FRBs) at radio frequencies <400 MHz is poorly understood, with only two sources detected below 300 MHz. We robustly characterise the 150-MHz activity of CHIME-detected FRB sources relative to their 60…

Investigating the Sightline of a Highly Scattered Fast Radio Burst through a Cosmic Sheet Structure in the Local Universe Open

Kaitlyn Shin, Calvin Leung, Sunil Simha, Bridget C. Andersen, Emmanuel Fonseca , et al. · 2025

Fast radio bursts (FRBs) are unique probes of extragalactic ionized baryonic structure as each signal, through its burst properties, holds information about the ionized matter it encounters along its sightline. FRB 20200723B is a burst wit…

CHIME/FRB Outriggers: Design Overview Open

M. Amiri, Bridget C. Andersen, Shion Andrew, Kevin Bandura, Mohit Bhardwaj , et al. · 2025

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) has emerged as the world’s premier facility for studying fast radio bursts (FRBs) through its fast transient search backend CHIME/FRB. The CHIME/FRB Outriggers project will augment…

Morphology of 35 Repeating Fast Radio Burst Sources at Microsecond Time Scales with CHIME/FRB Open

Alice P. Curtin, Ketan R. Sand, Ziggy Pleunis, Naman Jain, V. M. Kaspi , et al. · 2025

The Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) project has discovered the most repeating FRB sources of any telescope. However, most of the physical conclusions derived from this sample are based on data wi…

A Spatial Gap in the Sky Distribution of Fast Radio Burst Detections Coinciding with Galactic Plasma Overdensities Open

Swarali Shivraj Patil, Robert Main, Emmanuel Fonseca, Kyle McGregor, B. M. Gaensler , et al. · 2025

We analyze the positional and morphological properties of about 3600 unique fast radio burst (FRB) sources reported in the second FRB catalog generated by the Canadian Hydrogen Intensity Mapping Experiment (CHIME) telescope. We find a two-…

A milliarcsecond localization associates FRB 20190417A with a compact, luminous persistent radio source and an extreme magneto-ionic environment Open

Alexandra Moroianu, Shivani Bhandari, M. R. Drout, Jason W. T. Hessels, D. M. Hewitt , et al. · 2025

We report the milliarcsecond localization of a high (1379 pc/cc) dispersion measure (DM) repeating fast radio burst, FRB 20190417A. Combining European VLBI Network detections of five repeat bursts, we confirm the FRB's host to be a low-met…

FRB 20250316A: A Brilliant and Nearby One-off Fast Radio Burst Localized to 13 pc Precision Open

Thomas C. Abbott, Daniel Amouyal, Bridget C. Andersen, Shion Andrew, Kevin Bandura , et al. · 2025

Precise localizations of a small number of repeating fast radio bursts (FRBs) using very long baseline interferometry (VLBI) have enabled multiwavelength follow-up observations revealing diverse local environments. However, the 2%–3% of FR…

A Catalog of Local Universe Fast Radio Bursts from CHIME/FRB and the KKO Open

M. Amiri, Daniel Amouyal, Bridget C. Andersen, Shion Andrew, Kevin Bandura , et al. · 2025

We present the first catalog of fast radio burst (FRB) host galaxies from CHIME/FRB Outriggers, selected uniformly in the radio and the optical by localizing 81 new bursts to 2″ × ∼ 60″ accuracy using CHIME and the k’niʔatn k’l ⌣ stk’masqt…

FRB 20250316A: A Brilliant and Nearby One-Off Fast Radio Burst Localized to 13 parsec Precision Open

FRB Collaboration, Thomas C. Abbott, Daniel Amouyal, Shion Andrew, Kevin Bandura , et al. · 2025

Precise localizations of a small number of repeating fast radio bursts (FRBs) using very long baseline interferometry (VLBI) have enabled multiwavelength follow-up observations revealing diverse local environments. However, the 2--3\% of F…

Discovery and Localization of the Swift-Observed FRB 20241228A in a Star-forming Host Galaxy Open

Alice P. Curtin, Shion Andrew, Sunil Simha, Alice Cai, Kenzie Nimmo , et al. · 2025

On 2024 December 28, CHIME/FRB detected the thus-far non-repeating FRB 20241228A with a real-time signal-to-noise ratio of $>50$. Approximately 112~s later, the X-ray Telescope onboard the Neil Gehrels Swift Observatory was on source, the …

The CHIME/FRB Discovery of the Extremely Active Fast Radio Burst Source FRB 20240114A Open

Kaitlyn Shin, Alice P. Curtin, Maxwell Fine, Ayush Pandhi, Shion Andrew , et al. · 2025

Among the thousands of observed fast radio bursts (FRBs), a few sources exhibit exceptionally high burst activity observable by many telescopes across a broad range of radio frequencies. Almost all of these highly active repeaters have bee…

Polarization Properties of 28 Repeating Fast Radio Burst Sources with CHIME/FRB Open

Cherry Ng, Ayush Pandhi, Ryan Mckinven, Alice P. Curtin, Kijung Shin , et al. · 2025

As part of the Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) project, we report 41 new rotation measures (RMs) from 20 repeating fast radio bursts (FRBs) obtained between 2019 and 2023 for which no previous RM…

Improved Constraints on the Faraday Rotation toward Eight Fast Radio Bursts Using Dense Grids of Polarized Radio Galaxies Open

Ayush Pandhi, B. M. Gaensler, Ziggy Pleunis, Sebastian Hutschenreuter, Casey Law , et al. · 2025

We present 2–4 GHz observations of polarized radio galaxies toward eight fast radio bursts (FRBs), producing grids of Faraday rotation measure (RM) sources with sky densities of 9–28 polarized sources per square degree. Using a Bayesian in…

Rare Event Classification with Weighted Logistic Regression for Identifying Repeating Fast Radio Bursts Open

Antonio Herrera-Martín, Radu V. Craiu, Gwendolyn M. Eadie, David C. Stenning, Derek Bingham , et al. · 2025

An important task in the study of fast radio bursts (FRBs) remains the automatic classification of repeating and nonrepeating sources based on their morphological properties. We propose a statistical model that considers a modified logisti…

Improved constraints on the Faraday rotation towards eight fast radio bursts using dense grids of polarized radio galaxies Open

Ayush Pandhi, B. M. Gaensler, Ziggy Pleunis, Sebastian Hutschenreuter, Casey Law , et al. · 2025

We present 2-4 GHz observations of polarized radio galaxies towards eight fast radio bursts (FRBs), producing grids of Faraday rotation measure (RM) sources with sky densities of 9-28 polarized sources per square degree. Using a Bayesian i…

A Catalog of Local Universe Fast Radio Bursts from CHIME/FRB and the KKO Outrigger Open

M. Amiri, Daniel Amouyal, Bridget C. Andersen, Shion Andrew, Kevin Bandura , et al. · 2025

We present the first catalog of fast radio burst (FRB) host galaxies from CHIME/FRB Outriggers, selected uniformly in the radio and the optical by localizing 81 new bursts to 2'' x ~60'' accuracy using CHIME and the KKO Outrigger, located …

Morphology of 137 Fast Radio Bursts Down to Microsecond Timescales from the First CHIME/FRB Baseband Catalog Open

Ketan R. Sand, Alice P. Curtin, Daniele Michilli, V. M. Kaspi, Emmanuel Fonseca , et al. · 2025

We present a spectro-temporal analysis of 137 fast radio bursts (FRBs) from the first CHIME/FRB baseband catalog, including 125 one-off bursts and 12 repeat bursts, down to microsecond resolution using the least-squares optimization fittin…

A Repeating Fast Radio Burst Source in the Outskirts of a Quiescent Galaxy Open

Vishwangi Shah, Kaitlyn Shin, Calvin Leung, Wen‐fai Fong, T. Eftekhari , et al. · 2025

We report the discovery of the repeating fast radio burst (FRB) source FRB 20240209A using the Canadian Hydrogen Intensity Mapping Experiment (CHIME)/FRB telescope. We detected 22 bursts from this repeater between 2024 February and July, 6…

The Massive and Quiescent Elliptical Host Galaxy of the Repeating Fast Radio Burst FRB 20240209A Open

T. Eftekhari, Yuxin 雨欣 Dong 董, Wen‐fai Fong, Vishwangi Shah, Sunil Simha , et al. · 2025

The discovery and localization of FRB 20240209A by the Canadian Hydrogen Intensity Mapping Fast Radio Burst (CHIME/FRB) experiment marks the first repeating FRB localized with the CHIME/FRB Outriggers and adds to the small sample of repeat…

frb-voe: A Real-time Virtual Observatory Event Alert Service for Fast Radio Bursts Open

Thomas C. Abbott, A. V. Zwaniga, Charanjot Brar, V. M. Kaspi, Emily Petroff , et al. · 2024

We present frb-voe , a publicly available software package that enables radio observatories to broadcast fast radio burst (FRB) alerts to subscribers through low-latency virtual observatory events (VOEvents). We describe a use case of frb-…

A Repeating Fast Radio Burst Source in a Low-luminosity Dwarf Galaxy Open

D. M. Hewitt, Mohit Bhardwaj, Alexa C. Gordon, A. Yu. Kirichenko, Kenzie Nimmo , et al. · 2024

We present the localization and host galaxy of FRB 20190208A, a repeating source of fast radio bursts (FRBs) discovered using CHIME/FRB. As part of the Pinpointing REpeating ChIme Sources with EVN dishes repeater localization program on th…

A Search for Persistent Radio Sources toward Repeating Fast Radio Bursts Discovered by CHIME/FRB Open

Adaeze L. Ibik, M. R. Drout, B. M. Gaensler, Paul Scholz, Navin Sridhar , et al. · 2024

The identification of persistent radio sources (PRSs) coincident with two repeating fast radio bursts (FRBs) supports FRB theories requiring a compact central engine. However, deep nondetections in other cases highlight the diversity of re…

Morphology of 35 Repeating Fast Radio Burst Sources at Microsecond Time Scales with CHIME/FRB Open

Alice P. Curtin, Ketan R. Sand, Ziggy Pleunis, Naman Jain, V. M. Kaspi , et al. · 2024

The Canadian Hydrogen Intensity Mapping Experiment Fast Radio Burst (CHIME/FRB) project has discovered the most repeating fast radio burst (FRB) sources of any telescope. However, most of the physical conclusions derived from this sample a…

A repeating fast radio burst source in the outskirts of a quiescent galaxy Open

Vishal Shah, Kaitlyn Shin, Calvin Leung, W. Fong, T. Eftekhari , et al. · 2024

We report the discovery of the repeating fast radio burst source FRB 20240209A using the CHIME/FRB telescope. We have detected 22 bursts from this repeater between February and July 2024, six of which were also recorded at the Outrigger st…

The Massive and Quiescent Elliptical Host Galaxy of the Repeating Fast Radio Burst FRB20240209A Open

T. Eftekhari, Yuxin 雨欣 Dong 董, Wen‐fai Fong, Ved G. Shah, Sunil Simha , et al. · 2024

The discovery and localization of FRB20240209A by the Canadian Hydrogen Intensity Mapping Fast Radio Burst (CHIME/FRB) experiment marks the first repeating FRB localized with the CHIME/FRB Outriggers and adds to the small sample of repeati…

frb-voe: A Real-time Virtual Observatory Event Alert Service for Fast Radio Bursts Open

Thomas C. Abbott, A. V. Zwaniga, Charanjot Brar, V. M. Kaspi, Emily Petroff , et al. · 2024

We present frb-voe, a publicly available software package that enables radio observatories to broadcast fast radio burst (FRB) alerts to subscribers through low-latency virtual observatory events (VOEvents). We describe a use-case of frb-v…

Do All Fast Radio Bursts Repeat? Constraints from CHIME/FRB Far Sidelobe FRBs Open

Hsiu-Hsien Lin, Paul Scholz, Cherry Ng, Ue‐Li Pen, Mohit Bhardwaj , et al. · 2024

We report 10 fast radio bursts (FRBs) detected in the far sidelobe region (i.e., ≥5° off-meridian) of the Canadian Hydrogen Intensity Mapping Experiment (CHIME) from August 28 2018 to August 31 2021. We localize the bursts by fitting their…

Rare Event Classification with Weighted Logistic Regression for Identifying Repeating Fast Radio Bursts Open

Antonio Herrera-Martin, Radu V. Craiu, Gwendolyn M. Eadie, David C. Stenning, Derek Bingham , et al. · 2024

An important task in the study of fast radio bursts (FRBs) remains the automatic classification of repeating and non-repeating sources based on their morphological properties. We propose a statistical model that considers a modified logist…

A Repeating Fast Radio Burst Source in a Low-Luminosity Dwarf Galaxy Open

D. M. Hewitt, Mohit Bhardwaj, Alexa C. Gordon, A. Yu. Kirichenko, Kenzie Nimmo , et al. · 2024

We present the localization and host galaxy of FRB 20190208A, a repeating source of fast radio bursts (FRBs) discovered using CHIME/FRB. As part of the PRECISE repeater localization program on the EVN, we monitored FRB 20190208A for 65.6 h…

K-Contact Distance for Noisy Nonhomogeneous Spatial Point Data with application to Repeating Fast Radio Burst sources Open

Ashley M. Cook, Dayi Li, Gwendolyn M. Eadie, David C. Stenning, Paul Scholz , et al. · 2024

This paper introduces an approach to analyze nonhomogeneous Poisson processes (NHPP) observed with noise, focusing on previously unstudied second-order characteristics of the noisy process. Utilizing a hierarchical Bayesian model with nois…

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