Birth of a relativistic outflow in the unusual γ-ray transient Swift J164449.3+573451

@article{Zauderer2011BirthOA,
  title={Birth of a relativistic outflow in the unusual $\gamma$-ray transient Swift J164449.3+573451},
  author={B. Ashley Zauderer and Edo Berger and Alicia Margarita Soderberg and Abraham Loeb and Ramesh Narayan and Dale A. Frail and Glen Raymond Petitpas and Andreas Brunthaler and Ryan Chornock and John M. Carpenter and Guy G. Pooley and Kunal P. Mooley and Shrinivas R. Kulkarni and Raffaella Margutti and Derek B. Fox and Ehud Nakar and Nimesh Patel and N. H. Volgenau and Thomas L. Culverhouse and Michael F. Bietenholz and Michael P. Rupen and Walter Max-Moerbeck and Anthony C. S. Readhead and Joseph L. Richards and Martin C. Shepherd and Shaye P. Storm and Charles L. H. Hull},
  journal={Nature},
  year={2011},
  volume={476},
  pages={425-428}
}
Active galactic nuclei, which are powered by long-term accretion onto central supermassive black holes, produce relativistic jets with lifetimes of at least one million years, and the observation of the birth of such a jet is therefore unlikely. Transient accretion onto a supermassive black hole, for example through the tidal disruption of a stray star, thus offers a rare opportunity to study the birth of a relativistic jet. On 25 March 2011, an unusual transient source (Swift J164449.3+573451… 
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Observations of a bright X-ray flare from the extragalactic transient Swift J164449.3+573451 conclude that they have captured the onset of relativistic jet activity from a supermassive black hole.
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