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http://hdl.handle.net/20.500.12386/29585
Title: | AGILE Detection of a Candidate Gamma-Ray Precursor to the ICECUBE-160731 Neutrino Event | Authors: | LUCARELLI, Fabrizio PITTORI, Carlotta VERRECCHIA, Francesco Donnarumma, Imma TAVANI, MARCO BULGARELLI, ANDREA Giuliani, A. ANTONELLI, Lucio Angelo CARAVEO, PATRIZIA Cattaneo, P. W. Colafrancesco, S. Longo, F. MEREGHETTI, Sandro Morselli, A. PACCIANI, LUIGI PIANO, Giovanni Pellizzoni, A. P. PILIA, Maura Rappoldi, A. Trois, A. VERCELLONE, STEFANO |
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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Lucarelli_2017_ApJ_846_121.pdf | pdf editoriale | 1.88 MB | Adobe PDF | View/Open |
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