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AGILE detection of the new unidentified gamma-ray source AGL J2241+4454

ATel #2761; F. Lucarelli, F. Verrecchia (ASDC), E. Striani (Univ. Roma Tor Vergata and INFN Roma), C. Pittori (ASDC), M. Tavani (INAF/IASF-Rm, and Univ. 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), I. Donnarumma (INAF/IASF-Rm), 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. Piano, G. Pucella, S. Sabatini, A. Trois, V. Vittorini (INAF/IASF-Rm), F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, G. Di Cocco (INAF/IASF-Bo), A. Pellizzoni, M. Pilia (INAF/OA-Cagliari), G. Barbiellini, F. Longo, E. Moretti, E. Vallazza (INFN Trieste), A. Morselli, P. Picozza (INFN and Univ. Roma Tor Vergata), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), P. Santolamazza, S. Colafrancesco, P. Giommi (ASDC), L. Salotti (ASI)
on 27 Jul 2010; 17:21 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@asdc.asi.it)

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

AGILE is detecting intense gamma-ray emission above 100 MeV from a new unidentified source, AGL J2241+4454, with Galactic coordinates (l, b) = (100.0, -12.2) ± 0.6 deg (95% stat.) ± 0.1 deg (syst.) (R.A.=340.3, Dec.=44.9, J2000).

Integrating from 2010-07-25 01:00 UT to 2010-07-26 23:30 UT, a maximum likelihood analysis yields a detection at a significance level larger than 5 sigma, and a flux above 150 x 10E-8 ph/cm2/s (E > 100 MeV).

No prominent extragalactic or Galactic sources are known within the AGL J2241+4454 error circle.

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

Multifrequency observations of the AGL J2241+4454 error circle are strongly encouraged.