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AGILE detects a gamma-ray rebrightening of the blazar PKS 0903-57

ATel #15086; C. Pittori (SSDC and INAF/OAR), A. Bulgarelli (INAF/OAS-Bo), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Verrecchia, F. Lucarelli (SSDC and INAF/OAR), S. Vercellone (INAF/OA-Brera), I. Donnarumma (ASI), V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli, A. Di Piano (INAF/OAS-Bo), G. Piano, 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 5 Dec 2021; 12:26 UT
Credential Certification: Carlotta Pittori (carlotta.pittori@asdc.asi.it)

Subjects: Gamma Ray, >GeV, AGN, Blazar

Referred to by ATel #: 15094, 15135

AGILE is detecting intense gamma-ray activity above 100 MeV from the FSRQ PKS 0903-57 (also known as 5BZU J0904-5735). Integrating from 2021-12-03 08:00 UT until 2021-12-05 08:00 a preliminary multi-source maximum likelihood analysis yields a detection at the level of 6.2 sigma and a flux F(>100 MeV) = (3.4 +/- 0.9) x 10^-6 photons/cm^2/s.

Previous gamma-ray activity from this source was reported by AGILE in ATel #13602 and more recently (on November 19-20, 2021) by Fermi-LAT in ATel #15057.

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 PKS 0903-57 are strongly encouraged.