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|Title:||AGILE Detection of a Candidate Gamma-Ray Precursor to the ICECUBE-160731 Neutrino Event||Authors:||LUCARELLI, Fabrizio
ANTONELLI, Lucio Angelo
Cattaneo, P. W.
Pellizzoni, A. P.
|Issue Date:||2017||Journal:||THE ASTROPHYSICAL JOURNAL||Number:||846||Issue:||2||First Page:||121||Abstract:||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 T <SUB>0</SUB> 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 T <SUB>0</SUB>, which is positionally consistent with the ICECUBE error circle, that has a post-trial significance of about 4σ . 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.||URI:||http://hdl.handle.net/20.500.12386/29585||URL:||https://iopscience.iop.org/article/10.3847/1538-4357/aa81c8||ISSN:||0004-637X||DOI:||10.3847/1538-4357/aa81c8||Bibcode ADS:||2017ApJ...846..121L||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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checked on Jan 19, 2021
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