Issue |
A&A
Volume 695, March 2025
|
|
---|---|---|
Article Number | L10 | |
Number of page(s) | 6 | |
Section | Letters to the Editor | |
DOI | https://doi.org/10.1051/0004-6361/202453563 | |
Published online | 10 March 2025 |
Letter to the Editor
Constraints on the X-ray-to-radio fluence ratio of FRB 20240114A
1
Julius-Maximilians-Universität Würzburg, Institut für Theoretische Physik und Astrophysik, Lehrstuhl für Astronomie, Emil-Fischer-Straße 31, D-97074 Würzburg, Germany
2
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany
3
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, D-14482 Potsdam, Germany
4
Argelander Institute for Astronomy, Auf Dem Hügel 71, D-53121 Bonn, Germany
5
National Astronomical Research Institute of Thailand, Chiang Mai, Thailand
6
Centre of Astro-Engineering, Pontificia Universidad Catolica de Chile, Av. Vicuna Mackenna, 4860 Santiago, Chile
7
Department of Electrical Engineering, Pontificia Universidad Catolica de Chile, Av. Vicuna Mackenna, 4860 Santiago, Chile
8
European Southern Observatory, Karl-Schwarzschild-Str. 2, D-85748 Garching bei München, Germany
9
Joint ALMA Observatory, Alonso de Córdova, 3107 Vitacura, Santiago, Chile
10
Astropeiler Stockert e.V., Astropeiler 2-4, D-53902 Bad Münstereifel, Germany
11
LPC2E, OSUC, Univ Orléans, CNRS, CNES, Observatoire de Paris, F-45071 Orléans, France
⋆ Corresponding author; florian.eppel@uni-wuerzburg.de
Received:
20
December
2024
Accepted:
5
February
2025
We report on multiwavelength observations of FRB 20240114A, a nearby (z = 0.13), hyperactive, repeating fast radio burst that was discovered in January 2024. We performed simultaneous observations of the source with the Effelsberg 100-m radio telescope, the Thai National Radio Telescope, the Astropeiler Stockert, and the X-ray satellite XMM-Newton in May 2024. On May 23, 2024, we detected 459 bursts from the source using the Ultra-Broad-Band (UBB) receiver of the Effelsberg telescope, covering a frequency range from 1.3 GHz to 6 GHz. All bursts have simultaneous X-ray coverage, which allows us to put stringent constraints on the X-ray-to-radio fluence ratio, ηx/r, of FRB 20240114A. In this work, we focus on the three brightest radio bursts detected during the campaign. The brightest burst exhibits a radio fluence of 1.4 × 10−17 erg cm−2, while the 3σ upper limit of the 0.2−12 keV absorption-corrected X-ray burst fluence lies in the range of 3.4 × 10−11 erg cm−2 to 1.7 × 10−10 erg cm−2, depending on the spectral model. Assuming a 10 keV black-body spectrum, the X-ray-to-radio fluence ratio can be constrained to ηx/r < 1.2 × 107. A cutoff power law (Γ = 1.56, cutoff at 84 keV) is also considered, physically motivated by the Galactic magnetar SGR 1935+2154, which has previously shown X-ray bursts associated with FRB-like radio bursts at a measured X-ray-to-radio fluence ratio of ηx/r ∼ 2.5 × 105 (1−250 keV). In this scenario, we find that ηx/r < 2.4 × 106. Our results are consistent with FRB 20240114A being powered by a mechanism similar to that of SGR 1935+2154. We show that future multiwavelength campaigns will be able to improve this limit if sufficiently bright radio bursts are observed with simultaneous X-ray coverage.
Key words: radiation mechanisms: non-thermal / methods: data analysis / methods: observational / stars: magnetars / X-rays: bursts
© The Authors 2025
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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