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AGILE detection of an unidentified gamma-ray source at low Galactic latitude, AGLJ2251+6454

ATel #7227; A. Bulgarelli (INAF/IASF-Bo), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Pittori (ASDC and INAF/OAR), V. Fioretti (INAF/IASF-Bo), G. Piano (INAF/IAPS), F. Verrecchia (ASDC and INAF/OAR), S. Vercellone (INAF/IASF-Pa), F. Lucarelli (ASDC and INAF/OAR), E. Striani (CIFS and INAF/IAPS), I. Donnarumma (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, A. Trois (INAF/OA-Cagliari), M. Pilia (ASTRON, the Netherlands), 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), P. Giommi (ASDC), L. Salotti, G. Valentini, and F. D'Amico (ASI))
on 15 Mar 2015; 14:09 UT
Credential Certification: Andrea Bulgarelli (bulgarelli@iasfbo.inaf.it)

Subjects: Gamma Ray, Transient

Referred to by ATel #: 7231, 7232

AGILE is detecting intense gamma-ray emission above 100 MeV from an unidentified source, AGLJ2251+6454, at Galactic coordinates (l,b)=(110.63, 4.90) +/- 0.6 deg (95% stat.) +/- 0.1 deg (syst.) (R.A., Dec.= 342.86, 64.87 deg, J2000).

Integrating from 2015-03-12 22:19 UT to 2015-03-15 01:00 UT, a maximum likelihood analysis yields the detection of a source with a flux of (400+/-100) x 10E-8 ph/cm2/s (E > 100 MeV) with a significance level of 6 sigma.

No obvious counterpart is identified within the error box.

The discovery daily image in AITOFF projection is available at: http://agile.iasfbo.inaf.it/ATRT/20150315aitoff.png It is possible to follow the evolution in the "AGILEscience" App. The AGILE science alert system is described in Bulgarelli et al., ApJ, 781, 19, 2014.

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

Multi-frequency observations of sources in the AGILE error circle are strongly encouraged.