Constraints on the X-ray-to-radio fluence ratio of FRB 20240114A

Abstract

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, ${\eta }_{x/r}$, 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 $1.4\times 10^{-17}$ erg cm${}^{-2}$, while the $3\sigma$ upper limit of the 0.2$-$12 keV absorption-corrected X-ray burst fluence lies in the range of $3.4\times 10^{-11}$ erg cm${}^{-2}$ to $1.7\times 10^{-10}$ 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 ${\eta }_{x/r}<1.2\times 10^7$. A cutoff power law ($\Gamma =1.56$, 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 ${\eta }_{x/r}\sim 2.5\times 10^5$ (1$-$250 keV). In this scenario, we find that ${\eta }_{x/r}<2.4\times 10^6$. 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.

6 pages, 2 figures, 2 tables, accepted for publication in A&A

References in corpus (19)

• Gaia Data Release 3: Summary of the content and survey properties
• HI4PI: A full-sky HI survey based on EBHIS and GASS
• A fast radio burst associated with a Galactic magnetar
• Fast radio bursts as synchrotron maser emission from decelerating relativistic blast waves
• INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
• HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
• A peculiar hard X-ray counterpart of a Galactic fast radio burst
• PINT: A Modern Software Package for Pulsar Timing
• Implications of a "Fast Radio Burst" from a Galactic Magnetar
• The lowest frequency Fast Radio Bursts: Sardinia Radio Telescope detection of the periodic FRB 180916 at 328 MHz
• A radio pulsar phase from SGR J1935+2154 provides clues to the magnetar FRB mechanism
• Simultaneous X-ray and Radio Observations of the Repeating Fast Radio Burst FRB 180916.J0158+65
• The Fast Radio Burst FRB 20201124A in a star forming region: constraints to the progenitor and multiwavelength counterparts
• NuSTAR observations of X-ray bursts from the magnetar 1E 1048.1-5937
• Multiwavelength Constraints on the Origin of a Nearby Repeating Fast Radio Burst Source in a Globular Cluster
• The new magnetar SGR J1830-0645 in outburst
• Simultaneous and panchromatic observations of the Fast Radio Burst FRB 20180916B
• Contemporaneous X-ray Observations of 30 Bright Radio Bursts from the Prolific Fast Radio Burst Source FRB 20220912A
• Symmetry Breaking in Repeating Fast Radio Bursts

Cited by in corpus (2)

• Low-frequency, wideband study of an active repeater, FRB 20240114A, with the GMRT
• A broadband study of FRB20240114A with the Effelsberg 100-m radio telescope