AGILE detection of a possible rebrightening of the gamma-ray source AGL J2021+4032 in the Cygnus Region

ATel #1848; M. Tavani, G. Piano (INAF-IASF-Roma), A. Chen, A. Giuliani(INAF-IASF-Milano), A. Bulgarelli (INAF-IASF-Bologna), 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, F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli (INAF/IASF Bologna), P. Caraveo, 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, S. Sabatini (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Cattaneo (INFN Pavia), and D. Gasparrini, C. Pittori, F. Verrecchia, B. Preger, P. Santolamazza, S. Colafrancesco, P. Giommi (ASDC), L. Salotti (ASI)
on 17 Nov 2008; 20:19 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Marco Tavani (tavani@iasf-roma.inaf.it)

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During the current AGILE pointing centered near the Cygnus Region the Gamma-Ray Imaging Detector (GRID) has detected a source positionally consistent with the gamma-ray source previously reported in ATel#1585.

Integrating from 2008-11-16 14:33 UT to 2008-11-17 14:22 UT, a preliminary maximum likelihood analysis shows a detection at a significance level near 5 sigma, with a source flux more than two standard deviations above the mean flux reported in ATel#1585. The positional error box of the source AGL J2021+4032 (integrated over the total AGILE exposure of the field) is centered at Galactic coordinates l = 78.3 deg, b = 2.1 deg, and has a radius of about 0.2 degrees.

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 Cygnus field containing the gamma-ray source AGL J2021+4032.