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AGILE detection of the gamma-ray source AGL J2030+4043

ATel #1827; M. Tavani, S. Sabatini, G. Piano, F. D'Ammando, G. Pucella, V. Vittorini, E. Costa, M. Feroci, I. Donnarumma, L. Pacciani, E. Del Monte, F. Lazzarotto, P. Soffitta, Y. Evangelista, I. Lapshov, M. Rapisarda, A. Argan, A. Trois, G. De Paris (INAF/IASF Roma), M. Marisaldi, A. Bulgarelli, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli (INAF/IASF Bologna), A. Chen, P. Caraveo, A. Giuliani, S. Mereghetti, A. Pellizzoni, S. Vercellone, F. Perotti, M. Fiorini, A. Zambra (INAF/IASF Milano), G. Barbiellini, F. Longo, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Cattaneo (INFN Pavia), and S. Cutini, C. Pittori, F. Verrecchia, B. Preger, P. Santolamazza, S. Colafrancesco, P. Giommi (ASDC), L. Salotti (ASI)
on 4 Nov 2008; 19:29 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Marco Tavani (tavani@iasf-roma.inaf.it)

Subjects: Gamma Ray, Transient

Referred to by ATel #: 1828, 1830, 1839, 1850

During the current AGILE pointing centered near the Cygnus Region the Gamma-Ray Imaging Detector (GRID) detected a variable gamma-ray source.

Integrating from 2008-11-02 20:43 UT to 2008-11-03 20:32 UT, a preliminary maximum likelihood analysis shows a detection at a significance level above 4 sigma, with a source flux in excess of about 150e-8 ph/cm2/s for photon energies larger than 100 MeV.

The source positional error box is centered at Galactic coordinates l = 79.44 deg, b = 0.85 deg (R.A. = 20h 30m 31s, DEC = +40d 43m 09s) and has a preliminary 95% confidence radius of 0.9 degrees.

A preliminary analysis of the Super-AGILE data over the same time period and the same sky region does not show any counterpart in the 20-60 keV energy range, with a 3-sigma upper limit of 30 mCrab on the average flux.

We notice the presence in the AGILE-GRID error box of the prominent micro-quasar Cygnus X-3.

The AGILE monitoring of the field containing this source will continue until 2008-11-30 12:00 UT. We strongly encourage multi-frequency observations of the AGL J2030+4043 field, and in particular of Cygnus X-3.