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Gamma Ray Bursts (GRB) are the extremely energetic transient events, visiblefrom the most distant parts of the Universe. They are most likely powered byaccretion on the hyper-Eddington rates that proceeds onto a newly born stellarmass black hole. This central engine gives rise to the most powerful, highLorentz factor jets that are responsible for energetic gamma ray emission. Weinvestigate the accretion flow evolution in GRB central engine, using the 2DMHD simulations in General Relativity. We compute the structure and evolutionof the extremely hot and dense torus accreting onto the fast spinning blackhole, which launches the magnetized jets. We calculate the chemical structureof the disk and account for neutrino cooling. Our preliminary runs apply to theshort GRB case (remnant torus accreted after NS-NS or NS-BH merger). Weestimate the neutrino luminosity of such an event for chosen disk and centralBH mass

Accretion and outflow from a magnetized, neutrino cooled torus in the gamma ray burst central engine