| Description: | In our recent Nimmo et al. paper, published in the Astrophysical Journal Letters, we presented the localization of the repeating fast radio burst (FRB) source called FRB 20201124A. Using the European VLBI Network (EVN), we were able to achieve milliarcsecond precision, and show that the source is not coincident with a compact, persistent radio source (some other known repeating FRBs are coincident with a compact radio source, which may represent a nebula powered by the central source). We use the localization to consider the offset of the FRB source from local star formation, and also investigate the astrometric accuracy using the sample of 18 bursts from two separate epochs.
This figure shows the clean EVN 1.4 GHz map of the combined visibilities of all 18 bursts detected during both epochs, compared with the localisation from other interferometers (left panel; the tick marks indicate the burst source position) and the continuum EVN map with over-plotted contours of radio emission from star formation (right panel; the cross indicates the optical center of the host galaxy). See Nimmo et al. for more details.
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