AGILE Detection of a Candidate Gamma-Ray Precursor to the ICECUBE-160731 Neutrino Event
AGILE Detection of a Candidate Gamma-Ray Precursor to the ICECUBE-160731 Neutrino Event
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DOI：
10.3847/1538-4357/aa81c8
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发表时间：
2017-07
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通讯作者：
F. Lucarelli;F. Lucarelli;C. Pittori;C. Pittori;F. Verrecchia;F. Verrecchia;I. Donnarumma;M. Tavani;A. Bulgarelli;A. Giuliani;L. A. Antonelli;L. A. Antonelli;P. Caraveo;P. Cattaneo;S. Colafrancesco;S. Colafrancesco;F. Longo;S. Mereghetti;A. Morselli;L. Pacciani;G. Piano;A. Pellizzoni;M. Pilia;A. Rappoldi;A. Trois;S. Vercellone
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作者：
F. Lucarelli;F. Lucarelli;C. Pittori;C. Pittori;F. Verrecchia;F. Verrecchia;I. Donnarumma;M. Tavani;A. Bulgarelli;A. Giuliani;L. A. Antonelli;L. A. Antonelli;P. Caraveo;P. Cattaneo;S. Colafrancesco;S. Colafrancesco;F. Longo;S. Mereghetti;A. Morselli;L. Pacciani;G. Piano;A. Pellizzoni;M. Pilia;A. Rappoldi;A. Trois;S. Vercellone
2016年7月31日，ICECUBE合作报告了由天体物理中微子引起的高能起始事件的探测。在这里，我们报告了一个伽马射线对应的ICECUBE-160731事件，与AGILE卫星搜索。使用AGILE“突发搜索”系统，在中微子事件时间T0周围±1 ks的时间间隔内没有发现探测。在AGILE-GRID自动快速查看程序在预定义的48小时时间箱的结果中寻找可能的伽马射线前兆，我们发现在T0之前的1到2天之间超过100 MeV，这与ICECUBE误差圆的位置一致，具有约的试验后显著性。对这种过量的精细数据分析证实了后验自动检测。新的AGILE瞬变源，命名为AGL J1418+0008，因此可能是ICECUBE-160731伽马射线的前兆。没有其他太空任务或地面天文台报告检测到任何与ICECUBE事件一致的瞬时发射。我们表明，费米-LAT有一个低曝光的ICECUBE区域在AGILE伽马射线瞬变。基于对ICECUBE-160731和AGL J1418+0008误差区域内编目源的广泛搜索，我们发现了一个可能的共同对应物，显示了与高能峰值BL Lac（HBL）类耀变体相关的一些关键特征。使用专用SWIFT ToO数据对该来源的性质进行了进一步调查。
On 2016 July 31 the ICECUBE collaboration reported the detection of a high-energy starting event induced by an astrophysical neutrino. Here, we report on a search for a gamma-ray counterpart to the ICECUBE-160731 event, made with the AGILE satellite. No detection was found spanning the time interval of ±1 ks around the neutrino event time T0 using the AGILE “burst search” system. Looking for a possible gamma-ray precursor in the results of the AGILE-GRID automatic Quick Look procedure over predefined 48-hr time bins, we found an excess above 100 MeV between 1 and 2 days before T0, which is positionally consistent with the ICECUBE error circle, that has a post-trial significance of about . A refined data analysis of this excess confirms, a posteriori, the automatic detection. The new AGILE transient source, named AGL J1418+0008, thus stands as a possible ICECUBE-160731 gamma-ray precursor. No other space missions nor ground observatories have reported any detection of transient emission consistent with the ICECUBE event. We show that Fermi-LAT had a low exposure for the ICECUBE region during the AGILE gamma-ray transient. Based on an extensive search for cataloged sources within the error regions of ICECUBE-160731 and AGL J1418+0008, we find a possible common counterpart showing some of the key features associated with the high-energy peaked BL Lac (HBL) class of blazars. Further investigations on the nature of this source using dedicated SWIFT ToO data are presented.