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It is believed, that an off beaming relativistic jet, produces this weak GRB. Here we use the $E_{\\rm p,i}- E_{\\rm iso}$ and $\\Gamma - E_{\\rm iso}$ relations to determine the Lorentz factor $\\Gamma$ and the viewing angle from the edge of the jet $\\theta'_{\\rm obs}$ of GRB 170817A. Our result shows, $\\Gamma = 13.4 ^{+9.8}_{-5.5}$ and $\\theta'_{\\rm obs} = 4.3^{+1.8}_{-1.5} \\,^{\\circ}$. 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