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One ultraluminous X-ray source in M82 is identified as an accreting neutronstar recently (named as NuSTAR J095551+6940.8). It has a super-Eddingtonluminosity and is spinning up. For an aged magnetar, it is more likely to be alow magnetic field magnetar. An accreting low magnetic field magnetar mayexplain both the super-Eddington luminosity and the rotational behavior of thissource. Considering the effect of beaming, the spin-up rate is understandableusing the traditional form of accretion torque. The transient nature, spectralproperties of M82 X-2 are discussed. The theoretical period range of accretingmagnetar is provided. Three observational appearances of accreting magnetarsare summarized.

An accreting low magnetic field magnetar for the ultraluminous X-ray source in M82