Light emitted by the hot gas swirling around the black hole passed near this magnetar before reaching us.
One magnetar is only about a light-year from the black hole at the center of the Milky Way.
That extra spin in the progenitor star might have been enough to give the neutron star more magnetic power, making it a magnetar.
a young neutron star, perh. formed in supernova explosions and having an immense magnetic field; also called soft gamma repeater
Discovery of a magnetar solves 19 year mystery in astrophysics.
magne(tic) + (s)tar