CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

Collaboration, The CHIME/FRB; :,; Andersen, Bridget C.; Bandura, Kevin; Bhardwaj, Mohit; J., Boyle, P.; Brar, Charanjot; Cassanelli, Tomas; Chatterjee, S.; Chawla, Pragya; Cook, Amanda; Curtin, Alice P.; Dobbs, M.; Dong, Fengqiu Adam; Faber, Jakob T.; Fandino, Mateus; Fonseca, Emmanuel; Gaensler, B. M.; Giri, Utkarsh; Antonio, Herrera-Martin,; Hill, Alex; Ibik, Adaeze; Josephy, Alexander; Kaczmarek, Jane; Kader, Zarif; Kaspi, V. M.; Landecker, T. L.; Lanman, Adam; Lazda, Mattias; Leung, Calvin; Lin, Hsiu-Hsien; Masui, Kiyoshi W.; Mckinven, Ryan; Mena-Parra, Juan; Meyers, Bradley W.; Michilli, D.; Ng, Cherry; Pandhi, Ayush; Pearlman, Aaron B.; Pen, Ue-Li; Petroff, Emily; Pleunis, Ziggy; Rafiei-Ravandi, Masoud; Rahman, Mubdi; Ransom, Scott M.; Renard, A.; Sand, Ketan R.; Sanghavi, Pranav; Scholz, Paul; Shah, Vishwangi; Shin, Kaitlyn; Siegel, Seth R.; Stairs, I. H.; Su, Jiabin; Tendulkar, Shriharsh P.; Vanderlinde, K.; Wang, Haochen; Wulf, Dallas; Zwaniga, A. V.

doi:10.48550/arxiv.2301.08762

Cited by 3 publications

(2 citation statements)

References 58 publications

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“…Some observations show that repeating bursts have some special features (e.g., broader pulses and narrower spectra [23]). However, as the observing time increases, some previously named non-repeaters turn into repeaters [24]. The separation between the two populations becomes more blurred.…”

Section: The Source(s) Of Frbsmentioning

confidence: 96%

Solving the Mystery of Fast Radio Bursts: A Detective’s Approach

Zhang

2023

Universe

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Fast radio bursts (FRBs) are still a mystery in contemporary astrophysics. Unlike many other astronomical objects whose basic physical mechanism is already identified and the research on which focuses mainly on refining details, FRBs are still largely unknown regarding their source(s) and radiation mechanism(s). To make progress in the field, a “top-down” or “detective’s approach” is desirable. I will summarize how some key observational facts have narrowed down the options to interpret FRBs and show that at least some FRBs are produced from the magnetospheres of highly magnetized neutron stars (or magnetars). I will also argue that the current data seem to favor a type of coherent inverse Compton scattering process by relativistic particle bunches off a low-frequency wave propagating in the magnetosphere. This brief contribution is a shorter version of an extended review to be published in Reviews of Modern Physics, and it was written as a tribute to the 80th anniversary of Remo Ruffini.

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Section: The Source(s) Of Frbsmentioning

confidence: 96%

Solving the Mystery of Fast Radio Bursts: A Detective’s Approach

Zhang

2023

Universe

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“…More than half of these localizations have been provided by the Australian Square Kilometre Array Pathfinder (ASKAP; Macquart et al 2010). While most FRBs are only seen once ("one-offs"), a small fraction (∼ 4 %) of them have been found to produce multiple bursts ("repeaters") (Spitler et al 2016;CHIME/FRB Collaboration et al 2021;Fonseca et al 2020;Andersen et al 2023).…”

Section: Introductionmentioning

confidence: 99%

A targeted search for FRB counterparts with Konus-Wind

Ridnaia,

Frederiks,

Svinkin

2023

Monthly Notices of the Royal Astronomical Society

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We present results of the search for hard X-ray/soft γ-ray emission in coincidence with publicly reported (via Transient Name Server, TNS †) fast radio bursts (FRBs). The search was carried out using continuous Konus-Wind data with 2.944 s time resolution. We perform a targeted search for each individual burst from 581 FRBs, along with a stacking analysis of the bursts from 8 repeating sources in our sample and a separate stacking analysis of the bursts from the non-repeating FRBs. We find no significant associations in either case. We report upper bounds on the hard X-ray (20 - 1500 keV) flux assuming four spectral models, which generally describe spectra of short and long GRBs, magnetar giant flares, and the short burst, coincident with FRB 200428 from a Galactic magnetar. Depending on the spectral model, our upper bounds are in the range of (0.1 − 2) × 10−6 erg cm−2. For 18 FRBs with known distances we present upper bounds on the isotropic equivalent energy release and peak luminosity. For the nearest FRB 200120E, we derive the most stringent upper bounds of Eiso ≤2.0 × 1044 erg and Liso ≤1.2 × 1044 erg s−1. Furthermore, we report lower bounds on radio-to-gamma-ray fluence ratio Eradio/Eiso ≥ 10−11 − 10−9 and compare our results with previously reported searches and theoretical predictions for high-energy counterparts to FRBs.

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Classifying FRB spectrograms using nonlinear dimensionality reduction techniques

Yang

Zhang

Wang

et al. 2023

Monthly Notices of the Royal Astronomical Society

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Fast radio bursts (FRBs) are mysterious astronomical phenomena, and it is still uncertain whether they consist of multiple types. In this study we use two nonlinear dimensionality reduction algorithms - Uniform Manifold Approximation and Projection (UMAP) and t-distributed stochastic neighbour embedding (t-SNE) - to differentiate repeaters from apparently non-repeaters in FRBs. Based on the first Canadian Hydrogen Intensity Mapping Experiment (CHIME) FRB catalogue, these two methods are applied to standardized parameter data and image data from a sample of 594 sub-bursts and 535 FRBs, respectively. Both methods are able to differentiate repeaters from apparently non-repeaters. The UMAP algorithm using image data produces more accurate results and is a more model-independent method. Our result shows that in general repeater clusters tend to be narrowband, which implies a difference in burst morphology between repeaters and apparently non-repeaters. We also compared our UMAP predictions with the CHIME/FRB discovery of 6 new repeaters, the performance was generally good except for one outlier. Finally, we highlight the need for a larger and more complete sample of FRBs.

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CHIME/FRB Discovery of 25 Repeating Fast Radio Burst Sources

Cited by 3 publications

References 58 publications

Solving the Mystery of Fast Radio Bursts: A Detective’s Approach

Solving the Mystery of Fast Radio Bursts: A Detective’s Approach

A targeted search for FRB counterparts with Konus-Wind

Classifying FRB spectrograms using nonlinear dimensionality reduction techniques

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