J/A+A/709/A47 FRB 20240114A dynamic spectra of bursts detections (Limaye+, 2026)
A broadband study of FRB 20240114A with the Effelsberg 100-m radio telescope.
Limaye P., Spitler L.G., Manaswini N., Benacek J., Eppel F., Kadler M.,
Nicotera L., Wongphechauxsorn J.
<Astron. Astrophys. 709, A47 (2026)>
=2026A&A...709A..47L 2026A&A...709A..47L (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Spectra, radio
Keywords: methods: data analysis - telescopes - stars: magnetars -
stars: neutron - pulsars: general
Abstract:
FRB 20240114A is a hyperactive repeating fast radio burst (FRB) source
discovered by the CHIME/FRB Collaboration in January 2024. The source
has been followed up by numerous radio telescopes, including MeerKAT,
uGMRT, and FAST, and has been localized to a dwarf star-forming galaxy
at a redshift of z∼0.13 with a confirmed persistent radio source.
We report observations of FRB 20240114A with the Effelsberg 100-m
radio telescope using the Ultra BroadBand (UBB) receiver, covering
1.3-6.0GHz. Over four epochs, we detected more than 700 bursts,
providing an unprecedented broadband dataset for statistical analysis
of this active repeater.
We performed a comprehensive study of the bursts' morphologies,
occurrence rates, spectral and temporal widths, and waiting-time
distributions across six sub-bands spanning the UBB frequency range.
The bursts exhibit four main spectral morphologies, including simple,
complex, and frequency-drifting structures. No bursts were detected
across the full 1.3-6GHz band, confirming band-limited emission.
Burst widths show modest frequency evolution, while fractional
bandwidths remain roughly constant at ∼10%. Burst rates vary
strongly with time and frequency, partly influenced by scintillation.
The waiting-time distribution is bimodal, with largely independent
bursts and short-timescale clustering on ∼10ms, indicating a
characteristic emission timescale. The source can switch emission
frequencies by GHz on seconds and by ∼700MHz on millisecond
timescales, implying a highly agile emission mechanism.
Description:
Dynamic spectra of detections of FRB 20240114A bursts observed with
the Ultra BroadBand (UBB) receiver on the Effelsberg 100-m Radio
Telescope.
File naming convention: EBSSCCCCC.txt
- E: Epoch
1 = 16 Feb 2024
2 = 9 May 2024
3 = 23 May 2024
4 = 10 Jun 2024
- B: Band (1, 2, 3, 4, 5)
- SS: Scan number
(2 digits) (00-13)
Scans are continuous; each scan ∼30 minutes long.
For the 9 May epoch, scans start from 'scan0'; after a 30-minute
telescope downtime, observations resumed from 'scan1'.
- CCCCC: Candidate number (4 digits)
- The files contain only raw dynamic spectra.
- No derived quantities (e.g., fluence or widths) are included to preserve
material for future publications.
- All burst spectra are also available in PSRCHIVE format, including full
metadata. These files can be provided upon reasonable request to the
author, as the PSRCHIVE format is not currently supported for direct
submission to CDS.
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tabled1.dat 34 847 Burst properties
sp/* . 842 Indivudal spectra
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Byte-by-byte Description of file: tabled1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.8 d TOA Topocentric time of arrival of burst
(Modified Julian Date) (1)
16- 22 F7.4 ms Width Temporal width of the burst
24- 27 I4 MHz Bandwidth Observed bandwidth of the burst
29- 34 F6.1 MHz CenterFreq Central observing frequency
--------------------------------------------------------------------------------
Note (1): MJD refers to topocentric UTC time of the burst when de-dispersed at
527.97pc/cm3 with the top frequency channel of the detection band as
the reference frequency.
--------------------------------------------------------------------------------
Acknowledgements:
Pranav Limaye, pranav.limaye(at)cnrs-orleans.fr, limaye(at)mpifr-bonn.mpg.de
Centre National de la Recherche Scientifique
Max Planck Institute for Radio Astronomy
License: CC-BY-4.0 [see https://spdx.org/licenses/]
(End) Patricia Vannier [CDS] 16-Mar-2026