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Soft gamma-ray constraints on a bright flare from the Galactic Center supermassive black hole

Genzel, R.; Pantin, E.; Grosso, N. +11 more

Sagittarius A^★(SgrA^★) is the supermassive black hole residing at the center of the Milky Way. It has been the main target of an extensive multiwavelength campaign we carried out in April 2007. Herein, we report the detection of a bright flare from the vicinity of the horizon, observed simultaneously in X-rays (XMM-Newton/EPIC…