AGILE detection of gamma-ray flaring activity from the FSRQ Ton 0599

ATel #14785; F. Verrecchia (SSDC and INAF/OAR), G. Piano (INAF/IAPS), C. Pittori (SSDC and INAF/OAR), S. Vercellone (INAF/OA-Brera), I. Donnarumma (ASI), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Bulgarelli, V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli, A. Di Piano (INAF/OAS-Bo), F. Lucarelli (SSDC and INAF/OAR), M. Cardillo, A. Ursi, C. Casentini (INAF/IAPS), 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. Foffano, I. Lapshov, E. Menegoni, L. Pacciani, P. Soffitta, V. Vittorini (INAF/IAPS), F. Lazzarotto (INAF/OAPD), 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 (INFN Trieste), F. Longo (Univ. Trieste and INFN Trieste), E. Vallazza (INFN Milano Bicocca), 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 14 Jul 2021; 16:12 UT
Credential Certification: Francesco Verrecchia (francesco.verrecchia@asdc.asi.it)

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AGILE is detecting enhanced gamma-ray activity above 100 MeV from the FSRQ Ton 0599 (also known as 4C 29.45, PKS 1156+295; ICRS coords. (ep=J2000): RA 11 59 31.834 Dec +29 14 43.827, z=0.7). Integrating from 2021-07-11 UT 00:00:00 to 2021-07-13 UT 00:00:00, a preliminary multi-source maximum likelihood analysis yields a detection of 5 sigma and a flux F(>100 MeV) = (3.2 +/- 0.9) x 10^-6 photons/cm^2/s. During the previous 10 days (from July 1 to July 11), the average gamma-ray flux measured by AGILE was F(>100 MeV) = (1.3 +/- 0.3) x 10^-6 photons/cm^2/s and it was not detected on June.

Ton 0599 has been recently reported in optical and mm/sub-mm flaring activity (ATel #14775, 14781). The source is not included in any AGILE/GRID catalogue.

The AGILE/GRID detection was obtained while AGILE is observing in spinning mode, surveying a large fraction of the sky each day. The source can be monitored with the public mobile application "AGILEScience" developed by the AGILE Team, available for both Android and iOS devices.

Multifrequency observations of Ton 0599 are strongly encouraged.