Decreasing gamma-ray emission from the blazar 3C 454.3

ATel #3049; E. Striani (Univ. Roma Tor Vergata and INFN Roma), S. Vercellone (INAF/IASF-Pa), M. Tavani (INAF/IASF-Rm), F. Lucarelli, C. Pittori (ASDC), A. Bulgarelli, F. Gianotti, M. Trifoglio (INAF/IASF-Bo), F. Verrecchia, P. Santolamazza (ASDC), I. Donnarumma, V. Vittorini, E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda, A. Argan, G. Piano, G. Pucella, S. Sabatini, A. Trois (INAF/IASF-Rm), F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, G. Di Cocco (INAF/IASF-Bo), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Pellizzoni, M. Pilia (INAF/OA-Cagliari), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), F. D'Ammando (INAF-IASF Palermo), E. Moretti (KTH Stockholm), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Giommi,(ASDC), L. Salotti, G. Valentini (ASI)
on 22 Nov 2010; 17:48 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Marco Tavani (tavani@iasf-roma.inaf.it)

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Following the exceptional gamma-ray activity from the FSRQ 3C 454.3 (reported in the ATels #3034, #3043, and #3041), the source flux is currently decreasing, as monitored by the AGILE satellite.

3C 454.3 reached its peak emission approximately during the period Nov. 18-20, 2010. Integrating between MJD 55518.3 and MJD 55520.3, a maximum likelihood analysis gives an average flux F=(54.5 +/- 4.2) e-6 ph/cm2/sec (E > 100 MeV). The source showed significant flux variability.

The gamma-ray flux decreased by a factor of about 2.5 during the last 36 hours. An integration between 2010-11-21 04:50 UT and 2010-11-22 04:50 UT yields a flux F = (20.4 +/- 3.7) e-6 ph/cm2/sec (E > 100 MeV).

Follow-up observations of 3C 454.3 are strongly encouraged.