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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
Password Certification: Stefano Vercellone (

Subjects: X-ray, Gamma Ray, AGN, Quasars
Referred to by ATEL #: 2345

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.

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates