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Anomalous X-ray Pulsars (AXPs) are bright X-ray sources. Few AXPs emit highlypulsed emission in hard X-rays. Using data collected with the Large AreaTelescope on board Fermi Gamma-ray Space Telescope, we explored high-energygamma-ray emission from the brightest AXP, 4U 0142+61. We do not detect anysignificant emission from the source. Here, we present the upper limits to thepersistent and pulsed emission of 4U 0142+61 in the high-energy gamma-raydomain.

High-Energy Gamma-ray Emission Properties of an Anomalous X-ray Pulsar, 4U 0142+61