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AGILE detection of increasing gamma-ray emission from a region including 2FGL J1823.8+4312

ATel #4153; F. Lucarelli, F. Verrecchia, C. Pittori (ASDC and INAF/OAR), G. Piano (INAF/IAPS), E. Striani (Univ. Roma Tor Vergata), M. Cardillo (INAF/IAPS and Univ. Roma Tor Vergata), I. Donnarumma (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), S. Vercellone (INAF/IASF-Pa), A. Bulgarelli, F. Gianotti, M. Trifoglio (INAF/IASF-Bo), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), F. D'Ammando (INAF/IASF-Pa), E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda, A. Argan, G. Pucella, S. Sabatini, A. Trois, V. Vittorini (INAF/IAPS), F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, G. Di Cocco (INAF/IASF-Bo), A. Pellizzoni (INAF/OA-Cagliari), M. Pilia (ASTRON, the Netherlands), G. Barbiellini, F. Longo, E. Moretti, E. Vallazza (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), P. Santolamazza (ASDC and INAF/OAR), P. Giommi (ASDC), L. Salotti, and G. Valentini (ASI)
on 5 Jun 2012; 18:30 UT
Credential Certification: Francesco Verrecchia (francesco.verrecchia@asdc.asi.it)

Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Blazar, Transient

AGILE is detecting intense gamma-ray emission above 100 MeV from a source at Galactic coordinates (l,b)=(70.77, 22.82) +/- 0.8 deg (95% stat.) +/- 0.1 deg (syst.) (R.A., Dec.= 276.02, 42.85 deg, J2000).

Integrating from 2012-06-03 04:00 UT to 2012-06-05 04:00 UT, a maximum likelihood analysis yields a detection at a significance level of 5 sigma and a flux of (260+/-90) x 10E-8 ph/cm2/s (E > 100 MeV).

The AGILE detection is positionally consistent with the gamma-ray source 2FGL J1823.8+4312 (Abdo et a. 2011) classified as AGN of unknown type.

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

Multifrequency observations of the AGILE error circle are strong encouraged.