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AGILE detection of gamma-ray activity from the source AGL J2251-1239

ATel #11043; F. Lucarelli, F. Verrecchia, C. Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Bulgarelli (INAF/IASF-Bo), M. Cardillo, G. Piano (INAF/IAPS), V. Fioretti, N. Parmiggiani (INAF/IASF-Bo), M. Pilia (INAF/OA-Cagliari), S. Vercellone (INAF/OA-Brera), I. Donnarumma (ASI), 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, 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), A. Ferrari (Univ. Torino and CIFS), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), A. Antonelli (SSDC), P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 8 Dec 2017; 21:14 UT
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@asdc.asi.it)

Subjects: Gamma Ray, >GeV, Transient

Referred to by ATel #: 11127, 11136, 11141

AGILE is detecting intense gamma-ray emission above 100 MeV from a source, AGL J2251-1239, at Galactic coordinates (l,b)=(54.2, -58.4) +/- 0.7 deg (95% stat. c.l.) +/- 0.1 deg (syst.) (R.A., Decl. (J2000): 342.83, -12.66 deg).

Integrating from 2017-12-05 12:00 UT to 2017-12-08 12:00 UT, a preliminary maximum likelihood analysis yields a detection well above 5 sigma and a flux F(E>100 MeV)=(2.4 +/- 0.6) x 10^-6 ph cm^-2 s^-1.

The unassociated gamma-ray source 3FGL J2253.1-1237 and the BL Lac blazar 5BZB J2249-1300 (also known as 2WHSP J224910.7-13000) are inside the 95% c.l. AGILE error circle.

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode. Multifrequency observations of AGL J2251-1239 are strongly encouraged.