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AGILE detection of transient emission from the FSRQ TXS 0907+230 region

ATel #9623; P. Munar-Adrover, G. Piano (INAF/IAPS), G. Minervini (CIFS and INAF/IAPS), C. Pittori, F. Verrecchia (ASDC and INAF/OAR), A. Bulgarelli (INAF/IASF-Bo), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Lucarelli (ASDC and INAF/OAR), V. Fioretti, A. Zoli (INAF/IASF-Bo), I. Donnarumma (INAF/IAPS), S. Vercellone (INAF/IASF-Pa), E. Striani (CIFS and 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 14 Oct 2016; 14:44 UT
Credential Certification: Pere Munar-Adrover (pere.munar@iaps.inaf.it)

Subjects: Gamma Ray, Blazar, Quasar, Transient

AGILE is detecting an increased gamma-ray emission above 100 MeV from a source with galactic coordinates (l,b)= (206.5 deg, 39.8 deg) +/- 1.2 deg (stat 99% c.l.) +/- 0.1 deg (syst), marginally consistent with the flat spectrum radio quasar TXS 0907+230 (also known as 5BZQ J0910+2248) and associated to the gamma-ray Fermi source 3FGL J0910.9+2248.

Integrating from 2016-10-12 06:00 UT to 2016-10-14 06:00 UT, a preliminary maximum likelihood analysis yields a detection with a significance of 5.8 sigma, and a flux F(E>100 MeV)=(3.0 +/- 0.8) x 10^-6 ph cm^-2 s^-1. This corresponds to an increase by a factor of about 20 in the gamma-ray flux above 100 MeV with respect to the maximum 3FGL J0910.9+2248 monthly average.

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.

Multifrequency observations of the TXS 0907+230 region are strongly encouraged.