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AGILE detection of enhanced gamma-ray emission from BL Lacertae

ATel #3387; G. Piano, M. Tavani (INAF/IASF Roma), C. Pittori, F. Verrecchia, F. Lucarelli (ASDC), A. Bulgarelli (INAF/IASF Bologna), E. Striani, M. Cardillo (Univ. Tor Vergata), S. Sabatini (INAF/IASF Roma), F. Gianotti, M. Trifoglio (INAF/IASF Bologna), A. Argan, A. Trois, G. De Paris, E. Costa, I. Donnarumma, M. Feroci, L. Pacciani, E. Del Monte, F. Lazzarotto, P. Soffitta, Y. Evangelista, I. Lapshov, V. Vittorini, M. Giusti (INAF/IASF Roma), P. Caraveo, A. Chen, A. Giuliani, S. Mereghetti, F. Perotti (INAF/IASF Milano), M. Marisaldi, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli (INAF/IASF Bologna), G. Pucella, M. Rapisarda (ENEA-Roma), S. Vercellone, F. D'Ammando (IASF-Pa), A. Pellizzoni, M. Pilia (INAF/OA-Cagliari), G. Barbiellini, F. Longo (INFN Trieste), P. Picozza, A. Morselli (INFN and Univ. Tor Vergata), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Giommi, P. Santolamazza (ASDC), G. Valentini, L. Salotti (ASI).
on 29 May 2011; 19:05 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Giovanni Piano (giovanni.piano@iasf-roma.inaf.it)

Subjects: Gamma Ray, AGN, Blazar, Transient

Referred to by ATel #: 3459, 3462, 7687

AGILE is detecting intense gamma-ray emission above 100 MeV from a source positionally consistent with BL Lacertae, at Galactic coordinates (l, b) = (93.3, -10.22) +/- 0.8 (stat.) +/- 0.1 (syst.) deg.

Integrating from 2011-05-27 11:57:31 UT to 2011-05-29 11:30:51 UT (MJD: 55708.5-55709.5), a maximum likelihood analysis yields a detection at a significance level larger than 5 sigma and a flux F = (3.9 +/- 1.2) x 10^-6 ph/cm2/s (E > 100 MeV).

Enhanced gamma-ray flux from BL Lacertae was recently detected by Fermi-LAT (ATel #3368).

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.

Multifrequency observations of the BL Lacertae are strongly encouraged.