2/20/2024 0 Comments Neutrino plus apk download![]() ![]() In Section 4, we report on the multi-wavelength (MWL) follow-up, and in Section 5 we search for a possible e.m. In Section 3, we present the results of the AGILE observations, both near the prompt neutrino event time T0 and in archival data. In Section 2, we describe the main AGILE instrumental characteristics and its unique capabilities for searching for gamma-ray counterparts to triggered events of very short duration. In what follows, we report on a search for a gamma-ray counterpart of the ICECUBE-160731 neutrino event, made using the data of the AGILE satellite. The instant notice provides a first determination of the statistical relevance of the event and the reconstructed neutrino arrival direction, projected onto the sky, with its 90% and 50% containment radius (c.r).15 2017b) a few seconds after the event triggers. The communication is sent through the ICECUBE_HESE (a single high-energy starting ICECUBE neutrino) and the ICECUBE_EHE (extremely high-energy ICECUBE neutrino) GCN/AMON notice systems (Aartsen et al. Since 2016 April, the ICECUBE experiment has alerted the astronomical community, almost in real time, whenever an extremely high-energy, single-track neutrino event (with energy in the sub-PeV to PeV range) was recorded. 2013), the detection and identification of a clear neutrino point-like source would provide evidence of proton and hadron acceleration processes, resolving the long-lasting problem of the origin of cosmic rays (at least up to multi-PeV energies). In addition to the identification of the pion excess in gamma-ray observations of SNRs interacting with molecular clouds (Giuliani et al. 1998 Bednarek 2005 Vissani 2006 Sahakyan et al. Supernovae remnants (SNRs) expanding in dense molecular clouds and microquasars in our Galaxy, as well as the AGNs of the blazar class, are the main neutrino-source candidates up to PeV energies (Mannheim & Biermann 1989 Mannheim 1995 Halzen & Zas 1997 Protheroe et al. ![]() 2017a), but the ICECUBE apparatus might reach the necessary sensitivity or accumulate enough statistics to unambiguously detect anisotropy or clustering of events within a few more years of observations. No significant clustering of neutrinos above background expectation has been observed so far(Aartsen et al. 2011) and the subsequent first clear detection of a diffuse background of very high-energy (VHE) extra-terrestrial neutrinos (IceCube Collaboration 2013 Aartsen et al. ![]() Neutrino astronomy using underwater and under-ice Cherenkov detectors has entered a new era with the completion of the ICECUBE and ANTARES telescopes (Halzen & Klein 2010 Ageron et al. Further investigations on the nature of this source using dedicated SWIFT ToO data are presented. 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. We show that Fermi-LAT had a low exposure for the ICECUBE region during the AGILE gamma-ray transient. No other space missions nor ground observatories have reported any detection of transient emission consistent with the ICECUBE event. The new AGILE transient source, named AGL J1418+0008, thus stands as a possible ICECUBE-160731 gamma-ray precursor. A refined data analysis of this excess confirms, a posteriori, the automatic detection. 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 4\sigma. No detection was found spanning the time interval of 1 ks around the neutrino event time T0 using the AGILE "burst search" system. Here, we report on a search for a gamma-ray counterpart to the ICECUBE-160731 event, made with the AGILE satellite. On 2016 July 31 the ICECUBE collaboration reported the detection of a high-energy starting event induced by an astrophysical neutrino.
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