CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

Abstract

We present the discovery of 25 new repeating fast radio burst (FRB) sources found among CHIME/FRB events detected between 2019 September 30 and 2021 May 1. The sources were found using a new clustering algorithm that looks for multiple events co-located on the sky having similar dispersion measures (DMs). The new repeaters have DMs ranging from $\sim$220 pc cm${}^{-3}$ to $\sim$1700 pc cm${}^{-3}$, and include sources having exhibited as few as two bursts to as many as twelve. We report a statistically significant difference in both the DM and extragalactic DM (eDM) distributions between repeating and apparently nonrepeating sources, with repeaters having lower mean DM and eDM, and we discuss the implications. We find no clear bimodality between the repetition rates of repeaters and upper limits on repetition from apparently nonrepeating sources after correcting for sensitivity and exposure effects, although some active repeating sources stand out as anomalous. We measure the repeater fraction over time and find that it tends to an equilibrium of $2.6_{-2.6}^{+2.9}$% over our total time-on-sky thus far. We also report on 14 more sources which are promising repeating FRB candidates and which merit follow-up observations for confirmation.

ApJ in press. Comments are still welcome and follow-up observations are encouraged!

References in corpus (45)

• Array Programming with NumPy
• The Astropy Project: Sustaining and Growing a Community-oriented Open-source Project and the Latest Major Release (v5.0) of the Core Package
• A New Electron Density Model for Estimation of Pulsar and FRB Distances
• The Host Galaxy and Redshift of the Repeating Fast Radio Burst FRB 121102
• Fast Radio Bursts
• The First CHIME/FRB Fast Radio Burst Catalog
• A repeating fast radio burst source localised to a nearby spiral galaxy
• A Second Source of Repeating Fast Radio Bursts
• A repeating fast radio burst source in a globular cluster
• A repeating fast radio burst associated with a persistent radio source
• A bimodal burst energy distribution of a repeating fast radio burst source
• Possible periodic activity in the repeating FRB 121102
• Nine New Repeating Fast Radio Burst Sources from CHIME/FRB
• A nearby repeating fast radio burst in the direction of M81
• Fast Radio Burst Morphology in the First CHIME/FRB Catalog
• Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder
• Characterizing the FRB host galaxy population and its connection to transients in the local and extragalactic Universe
• A fast radio burst source at a complex magnetised site in a barred galaxy
• A Multi-telescope Campaign on FRB 121102: Implications for the FRB Population
• Diverse polarization angle swings from a repeating fast radio burst source
• LOFAR Detection of 110-188 MHz Emission and Frequency-Dependent Activity from FRB 20180916B
• Frequency-dependent polarization of repeating fast radio bursts-implications for their origin
• A Local Universe Host for the Repeating Fast Radio Burst FRB 20181030A
• A search for optical bursts from the repeating fast radio burst FRB 121102
• Detection of Repeating FRB 180916.J0158+65 Down to Frequencies of 300 MHz
• Are all fast radio bursts repeating sources?
• Inferring the Energy and Distance Distributions of Fast Radio Bursts using the First CHIME/FRB Catalog
• A sudden period of high activity from repeating Fast Radio Burst 20201124A
• An FRB Sent Me a DM: Constraining the Electron Column of the Milky Way Halo with Fast Radio Burst Dispersion Measures from CHIME/FRB
• Simultaneous multi-telescope observations of FRB 121102
• Large magnetic field variations towards the Galactic Centre magnetar, PSR J1745-2900
• Modeling Fast Radio Burst Dispersion and Scattering Properties in the First CHIME/FRB Catalog
• A burst storm from the repeating FRB 20200120E in an M81 globular cluster
• Interpreting the distributions of FRB observables
• On the Fast Radio Burst and Persistent Radio Source Populations
• Synthesizing the repeating FRB population using frbpoppy
• Gamma-Ray and X-Ray Observations of the Periodic-Repeater FRB 180916 During Active Phases
• An Injection System for the CHIME/FRB Experiment
• Scattering variability detected from the circumsource medium of FRB 20190520B
• No Evidence for Galactic Latitude Dependence of the Fast Radio Burst Sky Distribution
• Localizing FRBs through VLBI with the Algonquin Radio Observatory 10-m Telescope
• Deep simultaneous limits on optical emission from FRB 20190520B by 24.4 fps observations with Tomo-e Gozen
• Non-detection of CHIME/FRB sources with the Arecibo Observatory
• A Polarization Pipeline for Fast Radio Bursts Detected by CHIME/FRB
• Observational effects of banded repeating FRBs

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• The Physics of Fast Radio Bursts
• Detection of ultra-fast radio bursts from FRB 20121102A
• The second set of pulsar discoveries by CHIME/FRB/Pulsar: 14 Rotating Radio Transients and 7 pulsars
• Spectropolarimetric variability in the repeating fast radio burst source FRB 20180301A
• Measuring Hubble constant using localized and unlocalized fast radio bursts
• The discovery and significance of fast radio bursts
• An extremely active repeating fast radio burst source in a likely non-magneto-ionic environment
• Detecting Dark Matter Substructures on Small Scales with Fast Radio Bursts
• Gravitational Lensing in Modified Gravity: A case study for Fast Radio Bursts
• A Nançay Radio Telescope study of the hyperactive repeating FRB 20220912A
• A highly magnetized long-period radio transient exhibiting unusual emission features
• Exploring the Key Features of Repeating Fast Radio Bursts with Machine Learning
• The Northern Cross Fast Radio Burst project -- III. The FRB-magnetar connection in a sample of nearby galaxies
• A sudden dramatic change and recovery of magneto-environment of a repeating fast radio burst
• Multi-messenger Gravitational Lensing
• An X-ray Census of Fast Radio Burst Host Galaxies: Constraints on AGN and X-ray Counterparts
• The dispersion measure and rotation measure from fast radio burst host galaxies based on the IllustrisTNG50 simulation
• Expectations for Fast Radio Bursts in Neutron Star-Massive Star binaries
• The Northern Cross Fast Radio Burst project IV. Multi-wavelength study of the actively repeating FRB 20220912A
• Stimulated decay of collapsing axion stars and fast radio bursts
• Contemporaneous X-ray Observations of 30 Bright Radio Bursts from the Prolific Fast Radio Burst Source FRB 20220912A
• Unsupervised Machine Learning for Classifying CHIME Fast Radio Bursts and Investigating Empirical Relations
• Reinvestigation of Fast Radio Burst Host Galaxy and Event Rate Density
• Constraining Near-Simultaneous Radio Emission from Short Gamma-ray Bursts using CHIME/FRB
• The FAST Galactic Plane Pulsar Snapshot survey: IV. Discovery of five fast radio bursts
• The dispersion measure and scattering of Fast Radio Bursts: contributions from multi-components, and clues for the intrinsic properties
• A Hyperactive FRB Pinpointed in an SMC-Like Satellite Host Galaxy
• Contemporaneous optical-radio observations of a fast radio burst in a close galaxy pair
• Hyper-active repeating fast radio bursts from rotation modulated starquakes on magnetars
• Modeling the Cosmic Dispersion Measure in the D < 120 Mpc Local Universe
• Positive and unlabelled machine learning reveals new fast radio burst repeater candidates
• Novel standard candle: Collapsing axion stars
• Comprehensive analysis of the Apertif Fast Radio Burst sample: similarities with young, energetic neutron stars
• Comparative analysis of machine learning techniques for feature selection and classification of Fast Radio Bursts
• Modeling Current and Future High-Cadence Surveys of Repeating FRB Populations
• Constraints on fast radio burst emission in the aftermath of gamma-ray bursts
• A Very-High-Energy Gamma-Ray View of the Transient Sky
• Do Multi-Structural One-Off FRBs Trace Similar Cosmology History with Repeaters?
• Plasma lens with frequency-dependent dispersion measure effects on fast radio bursts
• The Northern Cross Fast Radio Burst project: V. Search for transient radio emission from Galactic magnetars
• Spectro-temporal analysis of ultra-fast radio bursts using per-channel arrival times
• Unveiling the distribution and redshift dependence of host galaxy dispersion measures using localized fast radio bursts
• H.E.S.S. programme searching for VHE gamma rays associated with FRBs
• A Practical Framework for Estimating the Repetition Likelihood of Fast Radio Bursts from Spectral Morphology
• Low-frequency-selected Fast Radio Burst Host Galaxy Candidates
• Unveiling the spectral morphological division of fast radio bursts with CHIME/FRB Catalog 2
• AGILE observations of a sample of repeating Fast Radio Burst sources
• Gravitational lensing of fast radio bursts: prospects for probing microlens populations in lensing galaxies
• Exploring the Link between Fast Radio Burst and Binary Neutron Star Origins with Spaceborne Gravitational Wave Observations