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

我们研制了用于MeV伽马射线天文宽空探测的长距离气球电子跟踪康普顿相机。飞行模型的性能测试表明，该模型在保持检测效率的前提下，具有良好的可靠性和对强背景条件的鲁棒性。通过这一模拟，将ETCC中的气体简单地改进为3atm的CF4，将使其有效面积增加到目前ETCC的10倍，这将使我们能够在一个月的飞行中探测到10-20个伽玛暴。这个预期的伽玛暴数目被认为足以证明ETCC在长时间早期伽玛暴的成像触发性能。

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.