AGILE detection of enhanced gamma-ray activity from BL Lacertae

ATel #10469; G. Piano (INAF/IAPS), C. Pittori, F. Lucarelli, F. Verrecchia (SSDC/ASDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), G. Minervini, P. Munar-Adrover, A. Ursi, M. Cardillo (INAF/IAPS), A. Bulgarelli, V. Fioretti, A. Zoli (INAF/IASF-Bo), I. Donnarumma (ASI), S. Vercellone (INAF/OA-Brera), E. Striani (CIFS and INAF/IAPS), F. Gianotti, M. Trifoglio (INAF/IASF-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), N. Parmiggiani (University of Modena and Reggio Emilia), A. Ferrari (Univ. Torino and CIFS), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), A. Antonelli (ASDC and INAF/OAR), P. Giommi (ASDC), L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 6 Jun 2017; 14:30 UT
Credential Certification: Giovanni Piano (giovanni.piano@iaps.inaf.it)

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AGILE is revealing enhanced gamma-ray activity above 100 MeV from a source positionally consistent with BL Lacertae (HB89 2200+420, z=0.0686). Integrating between 2017-06-04 UT 04:00:00 and 2017-06-06 UT 04:00:00, a preliminary multi-source likelihood analysis detects a gamma-ray flux F(>100 MeV) = (3.5 +/- 1.0) x 10^-6 photons/cm^2/s with a significance greater than 5 sigma. The current flux shows a clear increase with respect to the flux detected in the last two weeks, (4.6 +/- 1.9) x 10^-7 photons/cm^2/s.

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode. Multifrequency observations of BL Lacertae are strongly encouraged.