Swift J164449.3+573451, initially referred to as GRB 110328A, and sometimes abbreviated to Sw J1644+57, was a tidal disruption event (TDE), the destruction of a star by a supermassive black hole.

[3] Swift J1644+57 occurred when a star wandered too close to the central supermassive black hole in the galaxy, and was gravitationally torn apart, forming an accretion disk from stellar material.

[8] Continuous monitoring at radio and X-ray wavelengths indicated that after roughly 600 days (1.5 years), the relativistic jet shut off.

[9] This time likely corresponds with when the mass accretion from the stellar debris passed under the Eddington rate, at which point the jet was no longer fueled.

[10] Since then, the outflow has become non-relativistic in speed,[11] and emission is consistent with that of a shock wave that continues to expand into the surrounding material.