Study of MeV gamma-ray imaing trigger for early GRBs using Electron Tracking Compton Camera

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We have developed the Electron Tracking Compton Camera with long-flight balloon Experiment for a wide sky survey for MeV gamma-ray astronomy. Performance test of the Flight Model shows the good reliability of its simulation and the robustness for intense background condition with keeping its detection efficiency. By this simulation, an easy improvement with the change of gas in the ETCC to CF4 with 3atm will increase its effective area up to 10 times of the present ETCC, which will enable us to detect 10-20 GRBs in one month flight. This expected number of GRB is considered enough to certificate the ability of imaging trigger performance of ETCC for long duration early GRBs.