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Enhanced gamma-ray emission from the microquasar Cygnus X-3 detected by AGILE

ATel #8970; G. Piano (INAF/IAPS), C. Pittori, F. Verrecchia (ASDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Bulgarelli, V. Fioretti, A. Zoli (INAF/IASF-Bo), P. Munar-Adrover (INAF/IAPS), F. Lucarelli (ASDC and INAF/OAR), I. Donnarumma (INAF/IAPS), S. Vercellone (INAF/IASF-Pa), E. Striani (INFN Torino), 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 19 Apr 2016; 12:39 UT
Credential Certification: Giovanni Piano (giovanni.piano@iaps.inaf.it)

Subjects: Radio, X-ray, Gamma Ray, >GeV, Request for Observations, Binary, Black Hole, Transient

Integrating from 2016-04-16 00:00 UT to 2016-04-19 00:00 UT, the AGILE-GRID detector is revealing gamma-ray emission above 100 MeV from a source positionally consistent with Cygnus X-3 at Galactic coordinates (l, b) = (79.4, 0.2) +/- 0.6 (stat.) +/- 0.1 (syst.) deg, with flux F(>100 MeV) = (2.0 +/- 0.8) x 10^-6 photons/cm^2/s, as determined by a multi-source likelihood analysis.

The hard X-ray emission from Cygnus X-3, as monitored by the Swift-BAT instrument, is currently decreasing (public data available at http://swift.gsfc.nasa.gov/results/transients/CygX-3/ ). Gamma-rays above 100 MeV are usually detected from Cygnus X-3 in coincidence with decreasing or transitional states of its hard X-ray emission (Tavani et al., Nature, 462, 620, (2009); Abdo et al., Science, 326, 1512 (2009); Piano et al., A&A, 545, A110 (2012)).

We strongly encourage multi-frequency observations of Cygnus X-3.