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Anomalous x-ray pulsars (AXPs) are thought to be magnetars which are youngisolated neutron stars with extremely strong magnetic fields of > 10^14Gauss.Their tremendous magnetic fields inferred from the spin parameters provide ahuge energy reservoir to power the observed x-ray emission. High-energyemission above 0.3 MeV has never been detected despite intensive search. Here,we present the possible Fermi Large Area Telescope (LAT) detection of{\gamma}-ray pulsations above 200 MeV from the AXP, 1E 2259+586, which puts thecurrent theoretical models of {\gamma}-ray emission mechanisms of magnetarsinto challenge. We speculate that the high-energy {\gamma}-rays originate fromthe outer magnetosphere of the magnetar.

Pulsed {\gamma}-ray emission from magnetar 1E 2259+586