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AGILE confirms the enhanced gamma-ray emission from Cygnus X-3

ATel #8597; M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Bulgarelli (INAF/IASF-Bo), P. Munar (INAF/IAPS), C. Pittori, F. Lucarelli, F. Verrecchia (ASDC and INAF/OAR), V. Fioretti, A. Zoli (INAF/IASF-Bo), S. Vercellone (INAF/IASF-Pa), G. Piano (INAF/IAPS), E. Striani (CIFS and INAF/IAPS), I. Donnarumma (INAF/IAPS), M. Cardillo (INAF/OA-Arcetri and INAF/IAPS), F. Gianotti, M. Trifoglio (INAF/IASF-Bo), A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Chen (Wits University), A. Argan, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, I. Lapshov, L. Pacciani, P. Soffitta, S. Sabatini, V. Vittorini (INAF/IAPS), G. Pucella, M. Rapisarda (ENEA-Frascati), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, M. Marisaldi (INAF/IASF-Bo), A. Pellizzoni, M. Pilia, A. Trois (INAF/OA-Cagliari), G. Barbiellini, E. Vallazza (INFN Trieste), F. Longo (Univ. Trieste and INFN Trieste), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Univ. dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), S. Colafrancesco (INAF/OAR and Wits University), N. Parmiggiani (University of Modena and Reggio Emilia), A. Ferrari (Univ. Torino and CIFS), A. Antonelli (ASDC and INAF/OAR), P. Giommi (ASDC), L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 27 Jan 2016; 21:44 UT
Credential Certification: Andrea Bulgarelli (bulgarelli@iasfbo.inaf.it)

Subjects: Gamma Ray, Transient

Analysis of the AGILE-GRID data in spinning mode indicates that, integrating from 2016-01-18 19:13 UT to 2016-01-20 19:13 UT the source was detected with an average flux (E > 100 MeV) of (2.8 +/-1.2) x 10E-6 ph/cm2/s (errors are statistical).

Recent gamma-ray activity of Cyg X-3 was reported also by the Fermi team in ATEL #8591.

Considering the recent prominent minimum of the hard X-ray lightcurve as monitored by Swift/BAT and following variations (http://swift.gsfc.nasa.gov/results/transients/CygX-3/), Cyg X-3 might experience an instability that in other episodes observed in 2008-2011 led to the ejection of relativistic plasmoids in the form of a jet.

Multifrequency observations of Cyg X-3 are strongly encouraged.