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INTEGRAL/IBIS observation of the blazar 3C 454.3 during the decaying phase of the gamma-ray super-flare

ATel #2344; S. Vercellone (INAF/IASF-Pa), M. Fiocchi (INAF/IASF-Rm), E. Pian (SNS Pisa), M. Tavani, A. Bazzano, P. Ubertini (INAF/IASF-Rm), A. Argan, E. Costa, (INAF/IASF-Rm), F. D'Ammando (Univ. Roma Tor Vergata and INAF/IASF-Rm), E. Del Monte, I. Donnarumma, Y. Evangelista, M. Feroci, I. Lapshov, F. Lazzarotto, L. Pacciani, G. Piano, G. Pucella, M. Rapisarda, S. Sabatini, P. Soffitta (INAF/IASF-Rm), E. Striani (Univ. Roma Tor Vergata and INFN Roma), A. Trois, V. Vittorini (INAF/IASF-Rm), A. Bulgarelli, G. Di Cocco, F. Fuschino, M. Galli, F. Gianotti, C. Labanti, M. Marisaldi, M. Trifoglio (INAF/IASF-Bo), P. Caraveo, A. Chen, A. Giuliani, S. Mereghetti, F. Perotti (INAF/IASF-Mi), A. Pellizzoni, M. Pilia (INAF/OA-Cagliari), G. Barbiellini, F. Longo, E. Moretti, E. Vallazza (INFN Trieste), 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), S. Colafrancesco, P. Giommi, C. Pittori, P. Santolamazza, F. Verrecchia (ASDC), L. Salotti (ASI)
on 11 Dec 2009; 16:48 UT
Credential Certification: Stefano Vercellone (stefano@iasf-milano.inaf.it)

Subjects: X-ray, Gamma Ray, AGN, Quasar

Referred to by ATel #: 2345, 2352

The INTEGRAL satellite performed a Target of Opportunity observation of the blazar 3C 454.3 following the detection by the AGILE/GRID (ATel #2326) and by the Fermi/LAT (ATel #2328) of a gamma-ray super-flare above 100 MeV on 2009-12-02.

Integrating the data from 2009-12-06 16:41 UT to 2009-12-09 07:46 UT, for a net exposure of about 205 ks, we obtain a detection of the blazar with INTEGRAL/IBIS with a flux F(20-40 keV) = 13 mCrab (9.8E-11 erg/cm2/s), and a flux F(40-100 keV) = 16 mCrab (1.5E-10 erg/cm2/s). The 20-40 keV flux level shows a clearly decaying trend of the hard X-ray emission when compared with the flux levels observed by Swift/BAT (ATel #2330): 20 mCrab on 2009-12-01, 50 mCrab on 2009-12-03, followed by a steady flux level of 30 mCrab.

We kindly thank the INTEGRAL Team for promptly accepting and performing this observation.