Gamma-ray rebrightening of the blazar PKS 1424-418 detected by AGILE

ATel #15533; F. Verrecchia (SSDC and INAF/OAR), G. Piano (INAF/IAPS), C. Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), G. Panebianco (Univ. Bologna - INAF/OAS-Bo), A. Bulgarelli, V. Fioretti, N. Parmiggiani, A. Addis, L. Baroncelli, A. Di Piano (INAF/OAS-Bo), F. Lucarelli (SSDC and INAF/OAR), S. Vercellone (INAF/OA-Brera), M. Cardillo, A. Ursi, C. Casentini (INAF/IAPS), I. Donnarumma (ASI), 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)Firstname1 Lastname1 (Affil1), Firstname2 Lastname2 (Affil2)...
on 31 Jul 2022; 05:33 UT
Credential Certification: Francesco Verrecchia (francesco.verrecchia@ssdc.asi.it)

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The GRID gamma-ray detector onboard the AGILE satellite is detecting a gamma-ray rebrightening from the blazar PKS 1424-418 (z = 1.522, White et al., ApJ 327 561, 1988) already reported to be in an optical and GeV flaring activity period, either by Fermi/LAT (ATel #15525) and by AGILE/GRID (#15527).

Integrating from 2022-07-28 UT 05:00:00 to 2022-07-30 UT 06:00:00, a preliminary multi-source likelihood analysis yields a detection with a significance of 6.0 sigma and a gamma-ray flux F(>100 MeV) = (4 ± 1) x 10^-6 photons/cm^2/s. The average flux detected by the AGILE-GRID during the previous week, was F(>100 MeV) = (2.5 ± 0.5) x 10^-6 photons/cm^2/s. Multifrequency observations of this blazar are strongly encouraged.

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.