A Coincidence Search for Cosmic Neutrino and Gamma-Ray Emitting Sources Using IceCube and Fermi LAT Public Data

Abstract

We present results of an archival coincidence analysis between Fermi LAT gamma-ray data and public neutrino data from the IceCube neutrino observatory's 40-string (IC40) and 59-string (IC59) observing runs. Our analysis has the potential to detect either a statistical excess of neutrino + gamma-ray ($\nu$+$\gamma$) emitting transients or, alternatively, individual high gamma-multiplicity events, as might be produced by a neutrino observed by IceCube coinciding with a LAT-detected gamma-ray burst. Dividing the neutrino data into three datasets by hemisphere (IC40, IC59-North, and IC59-South), we construct uncorrelated null distributions by Monte Carlo scrambling of the neutrino datasets. We carry out signal-injection studies against these null distributions, demonstrating sensitivity to individual $\nu$+$\gamma$ events of sufficient gamma-ray multiplicity, and to $\nu$+$\gamma$ transient populations responsible for $>$14% (IC40), $>$9% (IC59-North), or $>$8% (IC59-South) of the gamma-coincident neutrinos observed in these datasets, respectively. Analyzing the unscrambled neutrino data, we identify no individual high-significance neutrino + high gamma-multiplicity events, and no significant deviations from the test statistic null distributions. However, we observe a similar and unexpected pattern in the IC59-North and IC59-South residual distributions that we conclude reflects a possible correlation ($p=7.0\%$) between IC59 neutrino positions and persistently bright portions of the Fermi gamma-ray sky. This possible correlation should be readily testable using eight years of further data already collected by IceCube. We are currently working with Astrophysical Multimessenger Observatory Network (AMON) partner facilities to generate low-latency $\nu$+$\gamma$ alerts from Fermi LAT gamma-ray, IceCube and ANTARES neutrino data and distribute these in real time to AMON follow-up partners.

12 pages, 9 figures, 1 table

References in corpus (11)

• The Astropy Project: Building an inclusive, open-science project and status of the v2.0 core package
• All-sky search for time-integrated neutrino emission from astrophysical sources with 7 years of IceCube data
• The contribution of Fermi-2LAC blazars to the diffuse TeV-PeV neutrino flux
• Constraining High-Energy Cosmic Neutrino Sources: Implications and Prospects
• Search for Prompt Neutrino Emission from Gamma-Ray Bursts with IceCube
• Constraints on Galactic Neutrino Emission with Seven Years of IceCube Data
• The IceCube Neutrino Observatory - Contributions to ICRC 2017 Part II: Properties of the Atmospheric and Astrophysical Neutrino Flux
• High-Energy Neutrino Flares From X-Ray Bright and Dark Tidal Disruptions Events
• Searches for small-scale anisotropies from neutrino point sources with three years of IceCube data
• Estimating the contribution of Galactic sources to the diffuse neutrino flux
• Search for Blazar Flux-Correlated TeV Neutrinos in IceCube 40-String Data

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• Active Galactic Nuclei and the Origin of IceCube's Diffuse Neutrino Flux
• Blazar -- IceCube neutrino association revisited
• Multimessenger Gamma-Ray and Neutrino Coincidence Alerts using HAWC and IceCube sub-threshold Data
• A Search for Cosmic Neutrino and Gamma-Ray Emitting Transients in 7.3 Years of ANTARES and Fermi LAT Data
• Analyzing the gamma-ray activity of neutrino emitter candidates: comparing TXS 0506+056 with other blazars
• Deepening gamma-ray point-source catalogues with sub-threshold information