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Sustained high-flux emission above 100 MeV from the Crab Nebula source

ATel #4867; F. Verrecchia (ASDC and INAF/OAR), E. Striani, M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Pittori (ASDC and INAF/OAR), S. Vercellone (INAF/IASF-Pa), A. Bulgarelli, F. Gianotti, M. Trifoglio, V. Fioretti (INAF/IASF-Bo), M. Cardillo (INAF/IAPS and Univ. Roma Tor Vergata), F. Lucarelli (ASDC and INAF/OAR), G. Piano, I. Donnarumma, E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, L. Pacciani, P. Soffitta, E. Costa, I. Lapshov, M. Rapisarda, A. Argan, G. Pucella, S. Sabatini, V. Vittorini (INAF/IAPS), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, G. Di Cocco (INAF/IASF-Bo), A. Pellizzoni, A. Trois (INAF/OA-Cagliari), M. Pilia (ASTRON, the Netherlands), F. Longo (INFN and Univ. Trieste), G. Barbiellini, E. Vallazza (INFN Trieste), A. Morselli, P. Picozza, (INFN and Univ. Roma Tor Vergata), M. Prest (Univ. dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), S. Colafrancesco (INAF-OAR and University of the Witwatersrand, Johannesburg), A. Antonelli (INAF/OAR and ASDC), P. Giommi (ASDC), L. Salotti, and G. Valentini (ASI)
on 6 Mar 2013; 23:53 UT
Credential Certification: Edoardo Striani (edoardo.striani@iasf-roma.inaf.it)

Subjects: Gamma Ray, Request for Observations, Neutron Star, Transient, Pulsar

Referred to by ATel #: 4869, 5485

AGILE is detecting sustained gamma-ray emission from the source positionally coincident with the Crab Nebula.

Integrating from 2013-03-05 13:00 UT until 2013-03-06 13:00 UT, the AGILE/GRID detects a gamma-ray flux F = (1.1 +/- 0.2) x 10^-5 ph cm^-2 s^-1 above 100 MeV for a significance above 9 sigma.

The source continues to be in a high-flux gamma-ray state above 100 MeV following the initial detections reported by Fermi-LAT (ATel #4855) and AGILE (ATel #4856).

Multifrequency observations of the Crab covering this episode of sustained gamma-ray emission are strongly encouraged.