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AGILE detection of enhanced gamma-ray activity from the blazar PKS 0903-57

ATel #13602; F. Lucarelli, C. Pittori, F. Verrecchia (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano, A. Ursi (INAF/IAPS), A. Bulgarelli, V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli (INAF/OAS-Bo), 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, F. Lazzarotto, I. Lapshov, 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, P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 1 Apr 2020; 10:45 UT
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@ssdc.asi.it)

Subjects: Gamma Ray, >GeV, Blazar, Transient

Referred to by ATel #: 13604, 13632, 13638, 15057, 15086

AGILE is detecting intense gamma-ray activity above 100 MeV from the blazar PKS 0903-57 (also known as 5BZU J0904-5735). Integrating from 2020-03-30 07:00:00 UT until 2020-04-01 07:00:00 UT, a preliminary multi-source maximum likelihood analysis yields a detection at the level of about 7.4 sigma and a flux F(>100 MeV) = (4.9 +/- 1.1) x 10^-6 photons/cm^2/s.

Previous gamma-ray activity from this source was reported in the recent ATel #13599.

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.