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Recently, the B.O.A.T. ("brightest of all time") gamma-ray burst, dubbed GRB221009A, was detected by various instruments. Unprecedentedly, the GRBpresented very-high-energy (VHE, energy above 0.1 TeV) gamma-ray emission withenergy extending above 10 TeV, as reported by the Large High Altitude AirShower Observatory (LHAASO). We here demonstrate that the VHE and especially>10 TeV emission may originate from the internal hadronic dissipation of theGRB, without the need of invoking any exotic processes as suggested by someprevious studies. We also discuss the constraints on the properties of the GRBejecta from multiwavelength and multi-messenger observations, which favors amagnetically dominated GRB ejecta. The suggested Poynting-flux-dominated GRBejecta in this work supports the Blandford & Znajek (BZ) mechanism as thepossible central engine model of GRB.

Implication of GRB 221009A: Can TeV Emission Come from the GRB Prompt Phase?