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AGILE detection of enhanced gamma-ray activity from a new unidentified source at high Galactic latitude, AGLJ0917+1511

ATel #8974; F. Lucarelli, C. Pittori, F. Verrecchia (ASDC and INAF/OAR), A. Bulgarelli, V. Fioretti, A. Zoli (INAF/IASF-Bo), G. Piano, P. Munar-Adrover (INAF/IAPS), M. Tavani (INAF/IAPS and Univ. Roma Tor Vergata), 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 20 Apr 2016; 16:17 UT
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@asdc.asi.it)

Subjects: Gamma Ray, Transient

AGILE is detecting intense gamma-ray emission above 100 MeV from an unidentified source, AGLJ0917+1511, at Galactic coordinates (l,b)=(214.99, 39.00) deg (R.A., Dec.= 139.27, 15.196 deg, J2000), with a statistical 95% c.l. elliptical error region with major and minor axes of 0.58 deg and 0.47 deg, respectively. The orientation angle of the ellipse major axis from the North direction is -48 deg counterclockwise. There is an additional systematic uncertainty of the order of 0.1 deg (95% c.l.).

Integrating from 2016-04-17 18:00 UT to 2016-04-19 18:00 UT, a maximum likelihood analysis yields the detection of the source with a flux of (2.7 +/- 0.9) x 10E-6 ph/cm2/s (E > 100 MeV) at a significance level above 5 sigma.

Just outside the AGILE error ellipse there is the Fermi-LAT source 3FGL J0912.7+1556, associated to the blazar 5BZG J0912+1555.

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

Multifrequency observations of sources in the AGILE error ellipse are strongly encouraged.