J/ApJS/278/49 Polarization characteristics of FRB 20240114A (Xie+, 2025)
Polarization characteristics of the hyperactive FRB 20240114A.
Xie J.-T., Feng Yi, Li Di, Zhang Y.-K., Zhou D.-K., Qu Y., Cui X.-H.,
Fang J.-H., Xu J.-Y., Miao C.-C., Yuan M., Tsai C.-W., Wang P., Niu C.-H.,
Chen X., Xue M., Zhang J.
<Astrophys. J. Suppl. Ser., 278, 49 (2025)>
=2025ApJS..278...49X 2025ApJS..278...49X
ADC_Keywords: Radio sources; Transient; Polarization
Keywords: Radio transient sources ; Radio sources ; Radio bursts
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 at frequencies ranging from 720 to
920MHz. A total of 437 bursts were detected, with a single observation
recording 365 bursts over 1.38hr, corresponding to a burst rate of
264 bursts per hour. The average rotation measures (RMs) were
347.0±1.0rad/m2 on 2024-Feb-23, and 353.7±0.6rad/m2 on
2024-Mar-01. 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.
Description:
FRB 20240114A was observed using the Green Bank Telescope (GBT)'s
P-band receiver and the VEGAS digital backend, covering a frequency
range of 720-920MHz. We conducted two observation sessions with the
GBT on 2024 February 23 and 2024 March 1. Each observation session
lasted 2hr, with approximately 1.33hr of on-source time after setup
and calibration.
See Section 2 for further explanations.
Objects:
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RA (ICRS) DE Designation(s)
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21 27 39.83 +04 19 45.6 FRB 20240114A = FRB 20240114A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 85 437 Measured properties of 437 bursts
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See also:
J/other/PASA/33.45 : FRBCAT: The Fast Radio Burst (FRB) Cat. (Petroff+, 2016)
J/ApJ/922/115 : Additional bursts at 1.4GHz for FRB 121102 (Aggarwal+, 2021)
J/ApJS/257/59 : First CHIME/FRB Fast Radio Burst Cat. (CHIME/FRB Col.+, 2021)
J/other/Nat/598.267 : List of radio bursts (Li+, 2021)
J/ApJ/955/142 : Bursts from FAST obs. of FRB 20220912A in 2022 (Zhang+, 2023)
J/A+A/704/A25 : FRB 20121102A parameters of the NRT bursts (Ng+, 2025
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- Seq [1/437] Burst index
5- 18 F14.8 d MJD [60363.8/60370.8] Modified Julian date (1)
20- 24 F5.1 pc/cm3 DM [526.8/531.6] Dispersion measure
26- 28 F3.1 pc/cm3 e_DM [0/2.8] Uncertainty in DM
30- 32 I3 rad/m2 RM [319/378]? Rotation measure obtained by
Stokes QU-fitting
34- 35 I2 rad/m2 e_RM [1/26]? Lower uncertainty in RM
37- 38 I2 rad/m2 E_RM [0/24]? Upper uncertainty in RM
40- 44 F5.1 % Linear [66/131.3]? Degree of linear polarization
46- 49 F4.1 % e_Linear [0.5/29.3]? Uncertainty in Linear
51- 55 F5.1 % Circ [-37.8/65.2]? Degree of circular polarization
57- 60 F4.1 % e_Circ [0.3/21.1]? Uncertainty in Circ
62- 64 I3 MHz FreqLow [721/880] Lower frequency of bursts (2)
66- 67 I2 MHz e_FreqLow [1/52] Uncertainty in FreqLow
69- 71 I3 MHz FreqUp [774/920] Upper frequency of bursts (2)
73- 74 I2 MHz e_FreqUp [1/25] Uncertainty in FreqUp
76- 80 F5.2 Jy.ms Fluence [0.1/19.9] Specific fluence
82- 85 F4.2 Jy.ms e_Fluence [0.02/0.13] Uncertainty in Fluence
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Note (1): Referenced to infinite frequency at the Solar System barycentre.
Note (2): The lower boundary near 721MHz and the upper boundary around 919MHz
are due to the proximity to the limits of the observational band.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 19-Feb-2026