Search for Gamma-Ray Bursts with the ARGO-YBJ Detector in Shower Mode
Search for Gamma-Ray Bursts with the ARGO-YBJ Detector in Shower Mode
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DOI：
10.3847/1538-4357/aa74bc
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发表时间：
2017-03
期刊：
影响因子：
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通讯作者：
B. Bartoli;P. Bernardini;X. Bi;Z. Cao;S. Catalanotti;S. Z. Chen;T. Chen;S. Cui;B. Dai
中科院分区：
文献类型：
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作者：
B. Bartoli;P. Bernardini;X. Bi;Z. Cao;S. Catalanotti;S. Z. Chen;T. Chen;S. Cui;B. Dai
ARGO-YBJ探测器位于羊八井宇宙射线实验室（4300 m a. s. l.），宽视场（~ 2 sr）和高占空比（>86%），使ARGO-YBJ适合搜索短和意外的伽马射线发射，如伽马射线暴（GRBs）。在2007年11月6日至2013年2月7日期间，在ARGO-YBJ视场（天顶角θ≤45°）内发生了156次卫星触发的伽马射线暴（其中24次红移已知）。在10-100 GeV和10-1000 GeV两个能量范围内，已经对与这些grb相关的可能发射进行了搜索。在与卫星探测相符的时间内，以及在爆发后一小时间隔内的一组不同时间窗内，都没有发现明显的过量。考虑到EBL吸收，已经评估了99%置信水平下能量影响的上限，其值范围为~ 10−5 erg cm−2至~ 10−1 erg cm−2。详细讨论了Fermi-LAT探测到的高能光子为33.4 GeV的Fermi-GBM爆发GRB 090902B。
The ARGO-YBJ detector, located at the Yangbajing Cosmic Ray Laboratory (4300 m a. s. l., Tibet, China), was a “full coverage” (central carpet with an active area of ∼93%) air shower array dedicated to gamma-ray astronomy and cosmic-ray studies. The wide field of view (∼2 sr) and high duty cycle (>86%), made ARGO-YBJ suitable to search for short and unexpected gamma-ray emissions like gamma-ray bursts (GRBs). Between 2007 November 6 and 2013 February 7, 156 satellite-triggered GRBs (24 of them with known redshift) occurred within the ARGO-YBJ field of view (zenith angle θ ≤ 45°). A search for possible emission associated with these GRBs has been made in the two energy ranges 10–100 GeV and 10–1000 GeV. No significant excess has been found in time coincidence with the satellite detections nor in a set of different time windows inside the interval of one hour after the bursts. Taking into account the EBL absorption, upper limits to the energy fluence at a 99% confidence level have been evaluated, with values ranging from ∼10−5 erg cm−2 to ∼10−1 erg cm−2. The Fermi-GBM burst GRB 090902B, with a high-energy photon of 33.4 GeV detected by Fermi-LAT, is discussed in detail.