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Discovery of a PRS associated with FRB 20240114A

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arxiv 2412.01478 v2 pith:DRN7CZPX submitted 2024-12-02 astro-ph.HE astro-ph.GAastro-ph.SR

G. Bruni , L. Piro , Y.-P. Yang , E. Palazzi , L. Nicastro , A. Rossi , S. Savaglio , E. Maiorano
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B. Zhang
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abstract

We present the discovery of the fourth persistent radio source (PRS) associated with a fast radio burst (FRB). Following previous indications of a candidate PRS associated with FRB20240114A, we performed deep VLBA observations at 5 GHz to test the presence of a compact radio source within the uncertainty position of this FRB ($\pm$200 mas). We detect a component $\sim$50 mas northwards the nominal position provided by the PRECISE collaboration. The corresponding radio luminosity, together with the Faraday rotation measure provided by previous observations of the FRB, locate this PRS in the expected region of the $L$ vs |RM| relation for the nebular model, further supporting it. The comparison of the measured flux density with the values collected at lower frequency by previous studies indicates a possible steepening of the radio spectrum in the 1-5 GHz range. Optical observations performed with the LBT could reveal that the FRB and its PRS lie at $\sim$1 kpc from the centre of the host galaxy, which is a dwarf sub-solar metallicity starburst galaxy with SFR $\sim 1 M_\odot\;\mathrm{yr^{-1}}$ and stellar mass $M\sim10^8 M_\odot$.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. One year of broadband radio monitoring of the enigmatic transient GRB 250702B reveals the evolution of the relativistic jet

    astro-ph.HE 2026-08 conditional novelty 6.0 of 10

    A year of 0.65-233 GHz monitoring shows GRB 250702B's radio afterglow is a synchrotron forward shock in a stratified medium, with a jet that is either narrow and fast or wide and slow.

  2. Unveiling the Local Environment of FRB 20220912A: Sub-arcsecond $4-26$ GHz Radio Continuum Mapping

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    A 75–190 pc non-thermal radio source coincident with FRB 20220912A is identified as a compact star-forming region with Σ_SFR ≳ 13 M☉/yr/kpc², supporting a young-magnetar progenitor channel.

  3. Long-term simultaneous 2.25/8.60~GHz monitoring of the newly-discovered repeating FRB~20240114A

    astro-ph.HE 2025-08 conditional novelty 6.0 of 10

    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.

  4. No Strong Evidence for Plasma Lensing in FRB 20240114A

    astro-ph.HE 2026-07 conditional novelty 5.5 of 10

    FAST and Parkes data show misaligned magnification peaks, no bandwidth narrowing, and chance-level carbon-copy pairs, so plasma lensing is not required for FRB 20240114A variability.

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