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ATEL # 1592; D. Gasparrini, C. Pittori, F. Verrecchia, B. Preger, P. Santolamazza, S. Colafrancesco, P. Giommi (ASDC), S. Vercellone, A. Chen, A. Giuliani (INAF/IASF Milan), I. Donnarumma, F. D'Ammando, L. Pacciani, G. Pucella, V. Vittorini (INAF/IASF Rome), F. Longo (INFN, Trieste), A. Bulgarelli (INAF/IASF Bologna), S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, E. Costa, M. Feroci, E. Del Monte, F. Lazzarotto, G. Piano, P. Soffitta, Y. Evangelista, I. Lapshov, M. Rapisarda, A. Argan, A. Trois, G. De Paris (INAF/IASF Rome), G. Barbiellini, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), F. Boffelli, P. Cattaneo (INFN Pavia) and L. Salotti (ASI)
on 26 Jun 2008; 17:06 UT
Password Certification: Carlotta Pittori (firstname.lastname@example.org)
Subjects: Gamma Ray, >GeV, AGN, Quasars
During the current Observing Block started on 2008-06-15 12:00 UT, the AGILE Gamma Ray Imaging Detector (GRID) detected 3C 454.3 in high state in the period between 2008-06-25 03:00 UT and 2008-06-26 03:00 UT.
A preliminary maximum likelihood analysis shows a detection at a significance level above 5 sigma, with a source flux in excess of about 200e-8 ph/cm2/s for E>100 MeV.
3C 454.3 was previously detected in high state several times by the AGILE-GRID during 2007 and 2008 (see also ATels #1160, #1167, #1278, #1300 and #1545). A very recent gamma-ray flare episode is reported in ATel #1581.
The AGILE monitoring of the source will continue till 2008-06-30 12:00 UT. We strongly encourage multi-frequency observations of 3C 454.3 during this gamma-ray high-state.