Sensitivity study of （10,100） GeV gamma-ray bursts with double shower front events from ARGO-YBJ

• Published in: 中国物理C：英文版 2016 (7), p.79-84
• Main Author: 周勋秀 高兰兰 张宇 郭义庆 朱清棋 贾焕玉 黄代绘
• Format: Article
• Language: English
• Subjects: 事件; 伽玛射线暴; 敏感性分析; 淋浴; 羊八井宇宙线观测站; 能量阈值; 蒙特卡洛模拟; 触发条件
• ISSN: 1674-1137; 0254-3052

ARGO-YBJ, located at the Yangbajing Cosmic Ray Observatory （4300 m a.s.l., Tibet, China）, is a full coverage air shower array, with an energy threshold of -300 GeV for gamma-ray astronomy. Most of the recorded events are single front showers, satisfying the trigger requirement of at least 20 particles detected in a given time window. However, in -11.5% of the events, two randomly arriving showers may be recorded in the same time window, and the second one, generally smaller, does not need to satisfy the trigger condition. These events are called double shower front events. By using these small showers, well under the trigger threshold, the detector primary energy threshold can be lowered to a few tens of GeV. In this paper, the angular resolution that can be achieved with these events is evaluated by a full Monte Carlo simulation. The ARGO-YBJ sensitivity in detecting gamma-ray bursts （GRBs） by using double shower front events is also studied for various cutoff energies, time durations, and zenith angles of GRBs in ARGO＇s field of view.