AGILE detection of the source AGL J2233-2212 in temporal and space closeness to the IceCube-190331A neutrino event

ATel #12623; F. Lucarelli (SSDC and INAF/OAR), M. Cardillo (INAF/IAPS), M. Tavani (INAF/IAPS and Univ. Roma Tor Vergata), C. Pittori, F. Verrecchia (SSDC and INAF/OAR), A. Bulgarelli, N. Parmiggiani, V. Fioretti (INAF/OAS-Bo), C. Casentini, G. Piano, A. Ursi (INAF/IAPS), I. Donnarumma (ASI), S. Vercellone (INAF/OA-Brera), F. Gianotti, M. Trifoglio (INAF/OAS-Bo), A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Chen (Wits University), A. Argan, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, L. Pacciani, P. Soffitta, V. Vittorini (INAF/IAPS), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti (INAF/OAS-Bo), M. Marisaldi (University of Bergen), A. Pellizzoni, M. Pilia, A. Trois (INAF/OA-Cagliari), G. Barbiellini, E. Vallazza (INFN Trieste), F. Longo (Univ. Trieste and INFN Trieste), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Univ. dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), A. Ferrari (Univ. Torino and CIFS), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), L. A. Antonelli (INAF/OAR), P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI).
on 2 Apr 2019; 14:58 UT
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@asdc.asi.it)

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Following the GCN circular #24028 emitted by the IceCube Collaboration on March 31, 2019 (Kopper et al., 2019), reporting the detection at T0=2019-03-31 06:55 UT of a very high energy neutrino with reconstructed arrival direction pointing at R.A. = 337.68 (+0.23, -0.34) deg (J2000), Decl. = -20.70 (+0.30, -0.48) deg (J2000) (90% PSF containment), we searched for transient gamma-ray emission in the AGILE data above 100 MeV.

Integrating from 2019-03-30 05:00 UT to 2019-04-02 05:00 UT, a preliminary maximum likelihood analysis yields a detection at a significance level of about 4 sigma, with a flux F(E>100 MeV)=(2.2 +/- 0.9) x 10^-06 ph/cm^2/s, located at equatorial coordinates (J2000) R.A., Decl.=(338.3, -22.2 [deg]) +/- 0.8 deg (95% stat. c.l.) +/- 0.1 deg (syst.) (Galactic coordinates: l,b=(34.2, -58.3)).

This is the first significant detection of AGL J2233-2212 since the start of the mission; it is also the fourth AGILE detection in temporal and space closeness with very high energy neutrino events announced by IceCube (Lucarelli et al. 2017 (ApJ 846, 121), and 2019 (ApJ 870, 136)).

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.