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AGILE detection of enhanced gamma-ray activity from BL Lacertae

ATel #7687; F. Lucarelli, C. Pittori, F. Verrecchia (ASDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), S. Vercellone (INAF/IASF-Pa), A. Bulgarelli, V. Fioretti (INAF/IASF-Bo), G. Piano (INAF/IAPS), E. Striani (CIFS and INAF/IAPS), I. Donnarumma (INAF/IAPS), M. Cardillo (INAF/OA-Arcetri 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), P. Giommi (ASDC), L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 22 Jun 2015; 14:31 UT
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@asdc.asi.it)

Subjects: Gamma Ray, >GeV, Blazar, Transient

After the recent TeV activity reported by the MAGIC telescopes (ATel #7660), AGILE is detecting intense gamma-ray emission above 100 MeV from a source positionally consistent with the blazar BL Lacertae.

Integrating from 2015-06-19 01:00 UT to 2015-06-21 13:00 UT, a preliminary maximum likelihood analysis yields a detection at a significance level above 5 sigma, and a flux F = (2.6 +/- 0.8) x 10^-6 ph/cm^2/s (E > 100 MeV).

Enhanced gamma-ray flux above 100 MeV from this object was already reported in the past by AGILE (ATel #3387) and FERMI-LAT (ATel #4028).

The AGILE-GRID detection was obtained while AGILE is observing in spinning mode, surveying a large fraction of the sky each day.

Further multifrequency observations of BL Lacertae are strongly encouraged.