AGILE detects enhanced gamma-ray emission from the region of the Narrow-Line Sy1 PMN J0948+0022
ATel #3448; F. Lucarelli (ASDC), G. Piano (INAF/IASF-Rm), F. Verrecchia (ASDC), S. Vercellone (INAF/IASF-Pa), M. Tavani (INAF/IASF-Rm, and Univ. Tor Vergata), I. Donnarumma (INAF/IASF-Rm), A. Bulgarelli, F. Gianotti, M. Trifoglio (INAF/IASF-Bo), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi),F. D'Ammando (INAF/IASF-Pa), 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, A. Trois, V. Vittorini (INAF/IASF-Rm), F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, G. Di Cocco (INAF/IASF-Bo), A. Pellizzoni, M. Pilia (INAF/OA-Cagliari), G. Barbiellini, F. Longo, E. Moretti, E. Vallazza (INFN Trieste), A. Morselli, P. Picozza, (INFN and Univ. Roma Tor Vergata), M. Cardillo (INAF/IASF-Rm and Univ. Tor Vergata), E. Striani (Univ. Roma Tor Vergata), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN and Univ. Roma Sapienza), P. W. Cattaneo, A. Rappoldi (INFN Pavia), C. Pittori (ASDC),P. Santolamazza, S. Colafrancesco, P. Giommi (ASDC), L. Salotti and and G. Valentini (ASI)
on 22 Jun 2011; 17:43 UT
Credential Certification: Fabrizio Lucarelli (fabrizio.lucarelli@asdc.asi.it)
Subjects: Gamma Ray, >GeV, Request for Observations, AGN, Transient
Referred to by ATel #: 4659
AGILE is detecting intense gamma-ray emission above 100 MeV at Galactic coordinates (l,b) = (237.4, 38.4) +/- 0.9 deg (95% stat.) +/- 0.1 deg (syst.) (R.A.,Dec.=147.4,0.3 deg, J2000).
Integrating from 2011-06-20 07:30 UT to 2011-06-22 11:20 UT, a maximum likelihood analysis yields a detection at a significance level of about 5 sigma and a flux of (310+/-100) x 10E-8 ph/cm2/s (E > 100 MeV).
On a 10 days integration starting from June 10th, we obtain only a 95% C.L. upper limit of 60 x 10E-8 ph/cm2/s (E > 100 MeV).
The AGILE source error box is consistent with the Narrow-Line Sy1 PMN J0948+0022 associated to the Fermi gamma-ray source 1FGL J0949.0+0021 (Abdo et al. 2010). A gamma-ray flux increase from this source has been recently reported by Fermi/LAT on June 11, 2011 (ATel #3429).
This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.
Multifrequency observations of the AGILE source error circle are strongly encouraged.
References: Abdo et al., 2010, ApJS, 188, 405.
