2024/08/20 by Tian, J., Rajwade, K. M., Pastor-Marazuela, I. +6 · 10 citations
#FOS: Physical sciences #High Energy Astrophysical Phenomena (astro-ph.HE)
paper · doi:10.48550/arxiv.2408.10988
We report observations of the highly active FRB 20240114A with MeerKAT using the Ultra-High Frequency (UHF; 544--1088 MHz) and L-band (856--1712 MHz) receivers. A total of 62 bursts were detected in coherent tied-array beams using the MeerTRAP real-time transient detection pipeline. We measure a structure-optimising dispersion measure of 527.65±0.01 pc cm-3 using the brightest burst in the sample. We find the bursts of FRB 20240114A are generally detected in part of the broad band of MeerKAT, ∼40% in the UHF and ∼30% in the L-band, indicating the band limited nature. We analyse the fluence distribution of the 44 bursts detected at UHF, constraining the fluence completeness limit to ∼1 Jy ms, above which the cumulative burst rate follows a power law R (>F)∝ (F/1 Jy ms)γ with γ=-1.8±0.2. Using channelised telescope data captured in our transient buffer we localise FRB 20240114A in the image domain to RA = 21h27m39.86s, Dec = +04d19m45.01s with an uncertainty of 1.4 arcsec. This localisation allows us to confidently identify the host galaxy of FRB 20240114A. Also using the transient buffer data we perform a polarimetric study and demonstrate that most of the bursts have ∼100% linear polarisation fractions and up to ∼20% circular polarisation fractions. Finally, we predict the flux density of a potential persistent radio source (PRS) associated with FRB 20240114A is \backsimeq[0.6--60] μJy based on the simple relation between the luminosity of the PRS and the rotation measure arising from the FRB local environment.