A Search for Cosmic Neutrino and Gamma-Ray Emitting Transients in 7.3 Years of ANTARES and Fermi LAT Data

H.A. Ayala Solares D.F. Cowen J.J. Delaunay D.B. Fox A. Keivani M. Mostafá K. Murase Colin F. Turley A. Albert 1 M. André M. Anghinolfi G. Anton M. Ardid J.-J. Aubert 2 J. Aublin 3 B. Baret 3 J. Barrios-Martí S. Basa 4 B. Belhorma V. Bertin 2 S. Biagi R. Bormuth J. Boumaaza S. Bourret 3 M. Bouta M.C. Bouwhuis H. Brânzaş R. Bruijn J. Brunner 2 J. Busto 2 A. Capone L. Caramete J. Carr 2 S. Celli M. Chabab R. Cherkaoui El Moursli T. Chiarusi M. Circella A. Coleiro 3 M. Colomer 3 R. Coniglione H. Costantini 2 P. Coyle 2 A. Creusot 3 A.F. Dí{}az A. Deschamps 5 C. Distefano I. Di Palma A. Domi R. Donà C. Donzaud 3, 6 D. Dornic 2 D. Drouhin 1 T. Eberl I. El Bojaddaini N. El Khayati D. Elsässer A. Enzenhöfer 2 A. Ettahiri F. Fassi P. Fermani G. Ferrara L. Fusco 3 P. Gay 7, 3 H. Glotin 8 R. Gozzini T. Grégoire 3 R. Gracia Ruiz 1 K. Graf S. Hallmann H. Van Haren A.J. Heijboer Y. Hello 5 J.J. Hernández-Rey J. Hößl J. Hofestädt G. Illuminati C.W. James M. de Jong M. Jongen M. Kadler O. Kalekin U. Katz N.R. Khan-Chowdhury A. Kouchner 3 M. Kreter I. Kreykenbohm V. Kulikovskiy R. Lahmann R. Le Breton 3 D. Lefèvre 9, 10 E. Leonora G. Levi M. Lincetto 2 D. Lopez-Coto M. Lotze S. Loucatos 11, 3 G. Maggi 2 M. Marcelin 4 A. Margiotta A. Marinelli J.A. Martínez-Mora R. Mele K. Melis P. Migliozzi A. Moussa S. Navas E. Nezri 4 C. Nielsen 3 A. Nuñez 2, 4 M. Organokov 1 G.E. Păvălaş C. Pellegrino M. Perrin-Terrin 2 P. Piattelli V. Popa T. Pradier 1 L. Quinn 2 C. Racca 12 N. Randazzo G. Riccobene A. Sánchez-Losa A. Salah-Eddine I. Salvadori 2 D.F.E. Samtleben M. Sanguineti P. Sapienza F. Schüssler 11 M. Spurio Th. Stolarczyk 11 M. Taiuti Y. Tayalati T. Thakore A. Trovato B. Vallage 11, 3 V. Van Elewyck 3 F. Versari S. Viola D. Vivolo J. Wilms D. Zaborov 2 J.D. Zornoza J. Zúñiga
Abstract : We analyze 7.3 years of ANTARES high-energy neutrino and Fermi LAT {\gamma}-ray data in search of cosmic neutrino + {\gamma}-ray ({\nu}+{\gamma}) transient sources or source populations. Our analysis has the potential to detect either individual {\nu}+{\gamma} transient sources (durations {\delta}t<1000 s), if they exhibit sufficient {\gamma}-ray or neutrino multiplicity, or a statistical excess of {\nu}+{\gamma} transients of individually lower multiplicities. Individual high {\gamma}-ray-multiplicity events could be produced, for example, by a single ANTARES neutrino in coincidence with a LAT-detected {\gamma}-ray burst. Treating ANTARES track and cascade event types separately, we establish detection thresholds by Monte Carlo scrambling of the neutrino data, and determine our analysis sensitivity by signal injection against these scrambled datasets. We find our analysis is sensitive to {\nu}+{\gamma} transient populations responsible for >5% of the observed gamma-coincident neutrinos in the track data at 90% confidence. Applying our analysis to the unscrambled data reveals no individual {\nu}+{\gamma} events of high significance; two ANTARES track + Fermi {\gamma}-ray events are identified that exceed a once per decade false alarm rate threshold (p = 17%). No evidence for subthreshold {\nu}+{\gamma} source populations is found among the track (p = 39%) or cascade (p = 60%) events. Exploring a possible correlation of high-energy neutrino directions with Fermi {\gamma}-ray sky brightness identified in previous work yields no added support for this correlation. Searches for transient sources of high-energy neutrinos remain interesting, with the potential for either neutrino clustering or multimessenger coincidence searches to lead to discovery of the first {\nu}+{\gamma} transients.
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Submitted on : Wednesday, May 15, 2019 - 2:41:20 PM
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H.A. Ayala Solares, D.F. Cowen, J.J. Delaunay, D.B. Fox, A. Keivani, et al.. A Search for Cosmic Neutrino and Gamma-Ray Emitting Transients in 7.3 Years of ANTARES and Fermi LAT Data. 2019. ⟨hal-02129991⟩

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