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We report on multi-frequency radio observations of the new magnetar SwiftJ1818.0-1607, following it for more than one month with high cadence. Theobservations commenced less than 35 hours after its registered first outburst.We obtained timing, polarisation and spectral information. Swift J1818.0-1607has an unusually steep spectrum for a radio emitting magnetar and also has arelatively narrow and simple pulse profile. The position angle swing of thepolarisation is flat over the pulse profile, possibly suggesting that ourline-of-sight grazes the edge of the emission beam. This may also explain thesteep spectrum. The spin evolution shows large variation in the spin-down rate,associated with four distinct timing events over the course of ourobservations. Those events may be related to the appearance and disappearanceof a second pulse component. The first timing event coincides with our actualobservations, while we did not detect significant changes in the emissionproperties which could reveal further magnetospheric changes. Characteristicages inferred from the timing measurements over the course of months vary bynearly an order of magnitude. A longer-term spin-down measurement overapproximately 100 days suggests an characteristic age of about 500 years,larger than previously reported. Though Swift J1818.0-1607 could still be oneof the youngest neutron stars (and magnetars) detected so far, we caution usingthe characteristic age as a true-age indicator given the caveats behind itscalculation.

High-cadence observations and variable spin behaviour of magnetar Swift J1818.0-1607 after its outburst