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In the third Fermi catalogue (3FGL) there are sixteen gamma-ray globularclusters. After analyzing the recent released Pass 8 data of Fermi Large AreaTelescope (LAT), we report the discovery of significant gamma-ray emission fromM 15 and NGC 6397, confirm that NGC 5904 is a gamma-ray emitter and findevidence of gamma-ray emission from NGC 6218 and NGC 6139. Inter- estingly, inthe globular clusters M 15, NGC 6397 and NGC 5904, millisecond pulsars (MSPs)have been found in radio or X-rays, which are strongly in support of the MSPorigin of the gamma-ray emission. However, due to the relative low luminosityof the gamma-ray emission we do not find any evidence for the gamma-raypulsation or flux variability of these sources.

Detection of gamma-ray emission from globular clusters M 15, NGC 6397, NGC 5904, NGC 6218 and NGC 6139 with Fermi-LAT