AGILE detection of a gamma-ray flare from the high-redshift FSRQ 4C +38.41
ATel #12005; G. Piano, M. Cardillo (INAF/IAPS), F. Verrecchia, C. Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), I. Donnarumma (ASI), S. Vercellone (INAF/OA-Brera), F. Lucarelli (SSDC and INAF/OAR), A. Ursi, G. Minervini (INAF/IAPS), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bo), P. Munar-Adrover (UAB), E. Striani (CIFS and 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, F. Lazzarotto, I. Lapshov, L. Pacciani, P. Soffitta, S. Sabatini, V. Vittorini (INAF/IAPS), G. Pucella, M. Rapisarda (ENEA-Frascati), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, M. Marisaldi (INAF/IASF-Bo), 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), S. Colafrancesco (INAF/OAR and Wits University), A. Ferrari (Univ. Torino and CIFS), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), A. Antonelli (INAF/OAR), P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 3 Sep 2018; 16:05 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Giovanni Piano (giovanni.piano@iaps.inaf.it)
Subjects: Gamma Ray, >GeV, AGN, Black Hole, Blazar, Quasar, Transient
AGILE is detecting intense gamma-ray emission above 100 MeV from a source at Galactic coordinates (l, b) = (61.23, 42.31) +/- 0.56 deg (stat.) +/- 0.10 deg (syst.), which is positionally consistent with the FSRQ 4C +38.41 (z = 1.81313). Integrating from 2018-09-01 UT 09:00:00 to 2018-09-03 UT 09:00:00, a preliminary multi-source likelihood analysis detects a gamma-ray flux F(>100 MeV) = (3.2 +/- 0.9) x 10^-6 photons/cm^2/s at a significance level of about 6 sigma. The flux is consistent with the last reported gamma-ray flare, observed by Fermi-LAT and AGILE on July 27, 2013 (ATel #5232, #5234).
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 4C +38.41 are strongly encouraged.
