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AGILE Detection of AGL J1023-3738, a new high-Galactic latitude unidentified source

ATel #2361; E. Striani (Univ. Roma Tor Vergata and INFN Roma), M. Tavani (INAF/IASF-Rm), A. Bulgarelli, F. Gianotti, M. Trifoglio (INAF/IASF-Bo), S. Vercellone (INAF/IASF-Pa), I. Donnarumma (INAF/IASF-Rm), F. D'Ammando (Univ. Roma Tor Vergata and INAF/IASF-Rm), 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. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Pellizzoni, M. Pilia (INAF/OA-Cagliari), G. Barbiellini, F. Longo, E. Moretti, E. Vallazza (INFN Trieste), A. Morselli, P. Picozza (INFN and Univ. RomaTor Vergata), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), C. Pittori, F. Verrecchia, P. Santolamazza, S. Colafrancesco, P. Giommi (ASDC), L. Salotti (ASI)
on 28 Dec 2009; 18:47 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Marco Tavani (tavani@iasf-roma.inaf.it)

Subjects: Gamma Ray, Transient

AGILE detected intense gamma-ray emission above 100 MeV from a new unidentified source at high Galactic latitudes (AGL J1023-3738), with Galactic coordinates (l, b) = (273.1, 16.5) +/- 0.7 (95% stat. confidence level error box radius).

Integrating from 2009-12-25 22:30 UT to 2009-12-27 22:10 UT, a maximum likelihood analysis yields a detection at a significance level larger than 5 sigma, and a flux F = (300+/-100)10-8 ph/cm2/s (E > 100 MeV). The source is still detectable with a significance level above 4 sigma for an integration between 2009-12-26 16:00 UT and 2009-12-28 10:00 UT.

No extragalactic or Galactic catalogued source is known within the error box of AGL J1023-3738.

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

Multifrequency observations of the AGL J1023-3738 error box are strongly encouraged.