| Abstract : | Fast radio bursts (FRBs) are millisecond-duration pulses with very high flux density and most-likely of extra-galactic origin. The actual origin and emission physics of FRBs are not understood yet, however, the leading theories involve magnetars as the candidate source of FRBs. Magnetars constitute a sub-class of neutron stars which exhibit extraordinarily high magnetic fields. Magnetars are mainly detected via their high energy emission, e.g., X-ray bursts or persistent emission. Some magnetars also exhibit transient radio emission. In their active phases, magnetar gives rise to bright radio pulses. The origin, as well as the classification of these pulses, is not very clear.
Here we present a case study on magnetar XTE J1810-197, the first ever magnetar known to exhibit transient radio emission. Since its second outburst in December 2018, Magnetar XTE J1810-197 has been regularly monitored using the Giant Metrewave Radio Telescope (GMRT). We primarily study the radio energetics of the magnetar via its bright radio bursts, and its potential evolution with time. Through this case study, we present answers to questions like: (1) is it possible that the magnetar J1810-197 could emit a burst with energy comparable to that of the repeating fast radio bursts or to that of the Galactic FRB 200428, and, (2) if yes, over what timescales? Our results, i.e., answers to the above questions, also have implications for the potential of observing FRB-like bursts from the Galactic population of magnetars.
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