PIRO, LUIGILUIGIPIROBruni, GabrieleGabrieleBruniTroja, E.E.TrojaO’Connor, B.B.O’ConnorPANESSA, FrancescaFrancescaPANESSARICCI, ROBERTOROBERTORICCIZhang, B.B.ZhangBURGAY, MARTAMARTABURGAYDichiara, S.S.DichiaraLee, K. J.K. J.LeeLOTTI, SimoneSimoneLOTTINiu, J. R.J. R.NiuPILIA, MauraMauraPILIAPOSSENTI, ANDREAANDREAPOSSENTITRUDU, MATTEOMATTEOTRUDUXu, H.H.XuZhu, W. W.W. W.ZhuKutyrev, A. S.A. S.KutyrevVeilleux, S.S.Veilleux2022-03-282022-03-2820210004-6361http://hdl.handle.net/20.500.12386/31981We present the results of a multiwavelength campaign targeting FRB 20201124A, the third closest repeating fast radio burst (FRB), which was recently localized in a nearby (z = 0.0978) galaxy. Deep VLA observations led to the detection of quiescent radio emission, which was also marginally visible in X-rays with Chandra. Imaging at 22 GHz allowed us to resolve the source on a scale of ? 1″ and locate it at the position of the FRB, within an error of 0.2″. The EVN and e-MERLIN observations sampled small angular scales, from 2 to 100 mas, providing tight upper limits on the presence of a compact source and evidence for diffuse radio emission. We argue that this emission is associated with enhanced star formation activity in the proximity of the FRB, corresponding to a star formation rate (SFR) of ≈10 M? yr-1. The surface SFR at the location of FRB 20201124A is two orders of magnitude larger than what is typically observed in other precisely localized FRBs. Such a high SFR is indicative of this FRB source being a newborn magnetar produced from a supernova explosion of a massive star progenitor. Upper limits to the X-ray counterparts of 49 radio bursts observed in our simultaneous FAST, SRT, and Chandra campaign are consistent with a magnetar scenario.STAMPAenArticle10.1051/0004-6361/2021419032-s2.0-85121206181https://doi.org/10.1051/0004-6361/202141903https://www.aanda.org/articles/aa/full_html/2021/12/aa41903-21/aa41903-21.htmlFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation