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The LHAASO collaboration has reported their observation of very high energyphotons ($E^{max}_\gamma \simeq 18$ TeV) from the gamma-ray burst GRB221009A.The sterile neutrino that involves both mixing and transition magnetic momentmay be a viable explanation for these high energy photon events. However, wedemonstrate that such a solution is strongly disfavored by the cosmic microwavebackground (CMB) and Big Bang nucleosynthesis (BBN) in the standard cosmology.

Can Sterile Neutrino Explain Very High Energy Photons from GRB221009A?