AGILE follow-up of the high-energy neutrino candidate event IceCube-190730A

ATel #12970; F. Lucarelli, C. Pittori, F. Verrecchia (SSDC and INAF/OAR), M. Tavani (INAF/IAPS and Univ. Roma Tor Vergata), A. Bulgarelli, N. Parmiggiani, V. Fioretti (INAF/OAS-Bo), M. Cardillo, 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 31 Jul 2019; 15:49 UT
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@asdc.asi.it)

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Following the GCN Circular posted by the IceCube Collaboration (Stein et al., GCN #25225), reporting the detection at T0=2019-07-30 20:50:41.31 UT of a high-energy neutrino candidate event, we searched for significant gamma-ray emission in the AGILE data above 100 MeV consistent with the IceCube error box.

No significant detections were obtained in 4 and 7-day time intervals ending at the IceCube-190730A T0.

As reported in GCN #25225, the FSRQ source PKS 1502+106 (also known as BZQ J1504+1029) appears within the 50% uncertainty region of IC-190730A. The source has been detected by AGILE in the first years of observations, as reported in the AGILE second source catalog as 2AGL J1507+1019 (Bulgarelli et al. (2019)), with an average flux F(E>100 MeV)=(18.3 +/- 5.5) x 10^-8 ph/cm^2/s.

No significant detections are obtained from the PKS 1502+106 during the last 4 and 7 days. A preliminary maximum likelihood analysis yields a 95% C.L. upper limit on the flux above 100 MeV of 8.0E-7 ph/cm^2/s for a 4-day integration starting at 2019-07-27 06:00 UT, and a 95% C.L. upper limit of 6.0E-07 ph/cm^2/s for a 7-day integration starting at 2019-07-24 06:00 UT.

Using the AGILE-LV3 online analysis tool, we found several significant flaring episodes from this source since the starting of the mission, with gamma-ray fluxes for E>100 MeV at the level or above 1E-06 ph/cm^2/s. No significant flaring episodes are observed during the last six months.

AGILE continues to monitor the IceCube-190730A/PKS 1502+106 region.

These measurements were obtained with AGILE observing a large portion of the sky in spinning mode.

AGILE-LV3 online analysis tool