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Polarization Characteristics of the Hyperactive FRB 20240114A
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abstract
Fast radio bursts (FRBs) are transient radio bursts of extragalactic origin characterized by millisecond durations and high luminosities. We report on observations of FRB 20240114A conducted with the Robert C. Byrd Green Bank Telescope (GBT) at frequencies ranging from 720 to 920 MHz. A total of 437 bursts were detected, with a single observation recording 365 bursts over 1.38 hours, corresponding to a burst rate of 264 bursts per hour. The average rotation measures (RMs) were $347.0 \pm 1.0$ rad m$^{-2}$ on February 23, 2024, and $353.7 \pm 0.6$ rad m$^{-2}$ on March 1, 2024. Of the 301 bursts with detected RMs, 81% have a linear polarization fraction greater than 90%, and 14% exhibit circular polarization with a signal-to-noise ratio $> 5$. Our sample also displayed polarization angle swings. We compared the linear polarization fraction of FRB~20240114A with those of the repeating sources FRB~20201124A and FRB~20220912A. Our analysis reveals that all three exhibit similar distributions in both linear and circular polarization fractions. These results indicate that the three sources share the same radiation mechanism. We analyze the fluence and waiting-time distributions of FRB~20240114A, revealing a right-skewed fluence distribution and a bimodal waiting-time structure, suggesting intrinsic emission timescales and potential multiple burst populations. Additionally, We present a novel method to determine the frequency range of bursts based on their spectral characteristics. This algorithm is independent of spectral models and remains unaffected by the removal of interference-affected channels in the data, ensuring robust performance.
Forward citations
Cited by 6 Pith papers
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Depolarization Induced by Rapid Polarization Angle Swings: A Common Feature of Pulsars and Fast Radio Bursts?
Rapid polarization-angle swings should depolarize pulsar and FRB emission, yielding an anti-correlation Π_L vs dPA/dt that has tentative support in a subset of pulsars.
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Long-term simultaneous 2.25/8.60~GHz monitoring of the newly-discovered repeating FRB~20240114A
A year of simultaneous 2.25 and 8.60 GHz monitoring of FRB 20240114A caught 155 bursts at the low frequency, none at the high frequency, revealing strong frequency-dependent activity.
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The CHIME/FRB Discovery of the Extremely Active Fast Radio Burst Source FRB 20240114A
FRB 20240114A, discovered by CHIME/FRB, is one of the most prolific repeating fast radio burst sources known: CHIME sees a stable dispersion measure near 528 pc cm^-3, a rotation measure near +320 rad m^-2, and a burs...
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MeerKAT discovery of a hyperactive repeating fast radio burst source
A new repeating fast radio burst source, FRB 20240619D, emitted 249 bursts in four hours and appears to favor a narrow emission band around 1.4 GHz.
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Propagation-induced Frequency-dependent Polarization Properties of Fast Radio Burst
A new analytical model shows that fast radio burst polarization spectra can precess on the Poincaré sphere when Faraday rotation and conversion are comparable, offering a physical alternative to the empirical generali...
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Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST
Multi-year FAST polarimetry of four repeating FRBs reveals strong RM variability in 64% of known repeaters and a shallow turbulence spectrum in the surrounding plasma.
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