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In this short letter, we find that a magnetic transition dipole momentbetween tau and sterile neutrinos can account for the XENON1T excess events.Unlike the ordinary neutrino dipole moment, the introduction of the new sterilemass scale allows for astrophysical bounds to be suppressed. Interestingly, thebest-fit regions that are compatible with the SN1987A imply either boron-8 orCNO neutrinos as the source flux. We find that sterile neutrinos of either$\sim$ 260 keV or in the $\sim$(500 - 800) keV mass range are capable ofevading astrophysical constraints while being able to successfully explain theXENON1T event rate. The sterile neutrino in the best fit parameter space mayhave significant effects on big bang nucleosynthesis (BBN). We show the regionin which a low reheating temperature of the Universe may allow the BBNconstraints to be alleviated.

An Active-to-Sterile Neutrino Transition Dipole Moment and the XENON1T Excess