AGILE confirms enhanced gamma-ray emission from the Crab Nebula
ATel #11415; A. Bulgarelli, N. Parmiggiani (INAF/IASF-Bo), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), S. Vercellone (INAF/OA-Brera), F. Verrecchia, C. Pittori, F. Lucarelli (SSDC and INAF/OAR), G. Piano, M. Cardillo, A. Ursi, G. Minervini (INAF/IAPS), V. Fioretti (INAF/IASF-Bo), M. Pilia (INAF/OA-Cagliari), I. Donnarumma (ASI), F. Gianotti, M. Trifoglio (INAF/IASF-Bo), A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), A. Chen (Wits University), A. Argan, E. Costa, E. Del Monte, Y. Evangelista, M. Feroci, F. Lazzarotto, I. Lapshov, L. Pacciani, P. Soffitta, S. Sabatini, V. Vittorini (INAF/IAPS), G. Pucella, M. Rapisarda (ENEA-Frascati), G. Di Cocco, F. Fuschino, M. Galli, C. Labanti, M. Marisaldi (INAF/IASF-Bo), A. Pellizzoni, A. Trois (INAF/OA-Cagliari), G. Barbiellini, E. Vallazza (INFN Trieste), F. Longo (Univ. Trieste and 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), A. Ferrari (Univ. Torino and CIFS), S. Colafrancesco (INAF/OAR and Wits University), F. Paoletti (East Windsor RSD Hightstown and INAF/IAPS), A. Antonelli (SSDC), P. Giommi, L. Salotti, G. Valentini, and F. D'Amico (ASI)
on 13 Mar 2018; 13:56 UT
Credential Certification: Andrea Bulgarelli (bulgarelli@iasfbo.inaf.it)
Subjects: Gamma Ray, >GeV, Pulsar
AGILE is monitoring the gamma-ray emission from the Crab Nebula identifying enhanced emission episodes such as "flares" and "long-waves" (see Striani et al., ApJ 765, 2013).
Integrating from 2018-03-11 04:00 UT to 2018-03-13 04:00 UT, AGILE/GRID detects enhanced gamma-ray emission from a source positionally consistent with the Crab Nebula.
The total (pulsar + Nebula) gamma-ray flux is: F = (5.4 +/- 1.3) x 10^-6 ph cm^-2 s^-1 (E > 100 MeV). This flux level is consistent with the recent ATel #11412 from Fermi/LAT, and is a factor of ~2 greater than the average gamma-ray flux.
This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.
Multifrequency observations of the Crab are strongly encouraged.
