用西藏ASγ实验三期数据 寻找TeV能区的γ暴
Search for TeV Gamma-Ray Bursts using Tibet-IIIAir Shower Array Data
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摘要: 利用西藏羊八井广延大气簇射三期阵列的重建数据,对TeV能区γ暴进行了全天区独立寻找.分析了约 14. 5亿个事例,找出了在给定的小天区和时间间隔内出现的事例团,并采用“等天顶角方法”估计背景.发现少 量事例团对背景有明显超出,但考虑到试验次数巨大,因此还不足以认定为γ暴.通过Monte Carlo模拟,给出了 在95%置信水平下流强上限的估计值为10-9~10-7光子/(cm2·s).Abstract: A search forTeV gamma-ray bursts (GRBs) was carried outby using the data ofTibet-III air shower array. About1. 45 billion eventswere analyzed. A GRB candidatewas chosen as a shower cluster appearing in a given small sky bin and a given time interva.l Themethod of equi-zenith angle was used to estimate the background. No significantTeV GRBswere detected. The flux upper limitat a 95% confidence levelwas estimated to be about10-9~10-7photons/(cm2·s) by theMonte Carlo simulation.
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Key words:
- cosmic ray /
- gamma-ray burst /
- extensive air shower /
- TeV energy region
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