Magnetar XTE J1810–197: Spectro-temporal Evolution of Average Radio Emission

We present the long-term spectro-temporal evolution of average radio emission properties magnetar XTE J1810-197 (PSR J1809-1943) following its most recent outburst in late 2018. report results from two and a half years monitoring campaign with upgraded Giant Metrewave Radio Telescope carried out over frequency range 300 - 1450 MHz. Our observations show intriguing time variability profile width, flux density, spectral index broadband shape. While width appears to gradually decrease at later epochs, density shows multiple episodes re-brightening course our monitoring. systematic reveal that spectrum has steepened time, resulting magnetar-like more pulsar-like spectrum. A detailed analysis reveals turnover, this turnover shifts towards lower frequencies time. details leading these results, discuss findings context mechanisms as well potential manifestations intervening medium. also briefly whether an evolving could be ubiquitous property magnetars.