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Renewed gamma ray activity of 3C 454.3 detected by AGILE

ATEL # 1545; I. Donnarumma, F. D'Ammando, L. Pacciani, G. Pucella, V. Vittorini (INAF/IASF Rome), A. Chen, A. Giuliani, S. Vercellone (INAF/IASF Milan), F. Longo (INFN, Trieste), A. Bulgarelli (INAF/IASF Bologna), S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milan), F. Gianotti, M. Trifoglio, G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, (INAF/IASF Bologna), M. Tavani, E. Costa, M. Feroci, E. Del Monte, F. Lazzarotto, P. Soffitta, Y. Evangelista, I. Lapshov, M. Rapisarda, A. Argan, A. Trois , G. De Paris (INAF/IASF Rome), G. Barbiellini, 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 P. Giommi, C. Pittori, D. Gasparrini, S. Cutini, B. Preger, P. Santolamazza, F. Verrecchia (ASDC) and L. Salotti (ASI)
on 27 May 2008; 13:10 UT
Distributed as an Instant Email Notice (Request for Observations)
Password Certification: Marco Feroci (

Subjects: Gamma Ray, AGN

The AGILE Gamma Ray Imaging Detector (GRID) detected new flaring activity from the blazar 3C 454.3 in the period between 2008-05-24 03:10 UT and 2008-05-27 04:17 UT. Despite the fact that the source is currently more than 35 degrees off-axis, a preliminary maximum likelihood analysis shows a detection at a significance level of about 9 sigma, with a source flux in excess of 100e-8 ph/cm2/s at energies above 100 MeV. This source was already detected in the gamma-ray energy band by the AGILE-GRID in July, November, and December 2007 (see ATELs #1160, #1167, #1278 and #1300). Monitoring of the source by AGILE will continue over the next weeks. We strongly encourage multi-frequency observations of 3C 454.3 during this new gamma-ray flaring state.

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R. E. Rutledge , Editor
ATEL Mirror v1.0 Updates