AGILE detection of prolonged gamma-ray emission from the Galactic Nova ASASSN-18fv
ATel #11553; G. Piano (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Bulgarelli, N. Parmiggiani (INAF/IASF-Bo), M. Cardillo, A. Ursi, G. Minervini (INAF/IAPS), I. Donnarumma (ASI), S. Vercellone (INAF/OA-Brera), V. Fioretti (INAF/IASF-Bo), M. Pilia (INAF/OA-Cagliari), 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 20 Apr 2018; 14:15 UT
Credential Certification: Giovanni Piano (giovanni.piano@iaps.inaf.it)
Subjects: Gamma Ray, >GeV, Request for Observations, Nova, Transient
Referred to by ATel #: 11677
AGILE detected intense gamma-ray emission above 100 MeV from a source at Galactic coordinates (l, b) = (287.08, -1.08) +/- 0.6 deg (68% stat. c.l.) +/- 0.1 deg (syst.) (R.A., Dec. = 159.94, -59.84 deg, J2000), positionally consistent with the Galactic Nova ASASSN-18fv, previously reported in a gamma-ray flaring state by Fermi-LAT (ATel #11546). The Nova was detected in a bright optical flare from March 20 (ATel #11454, #11456, #11460, #11467, #11508).
Integrating from 2018-04-14 00:00 UT to 2018-04-18 00:00 UT, a preliminary multi-source maximum likelihood analysis yields a detection above 4 sigma and a flux F(E>100 MeV) = (3.0 +/- 0.9) x 10^-6 ph cm^-2 s^-1.
This measurement was obtained with AGILE observing a large portion of the sky in spinning mode. Multifrequency observations of the source are strongly encouraged.
