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AGILE detection of enhanced gamma-ray emission from a position consistent with the blazar 4C +38.41

ATel #4389; F. Verrecchia, F. Lucarelli (ASDC and INAF/OAR), A. Bulgarelli (INAF/IASF-Bo), G. Piano (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), S. Vercellone (INAF/IASF-Pa), I. Donnarumma (INAF/IAPS), E. Striani (Univ. Roma Tor Vergata), M. Cardillo (INAF/IAPS and Univ. Roma Tor Vergata), F. Gianotti, M. Trifoglio (INAF/IASF-Bo), A. Chen, A. Giuliani, S. Mereghetti, P. Caraveo, F. Perotti (INAF/IASF-Mi), S. Colafrancesco (INAF/OAR and Wits University), 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/IAPS), F. Fuschino, M. Galli, C. Labanti, M. Marisaldi, G. Di Cocco (INAF/IASF-Bo), A. Pellizzoni (INAF/OA-Cagliari), M. Pilia (ASTRON, the Netherlands), G. Barbiellini, F. Longo, 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), C. Pittori, P. Santolamazza (ASDC and INAF/OAR), P. Giommi (ASDC), L. Salotti, and G. Valentini (ASI)
on 18 Sep 2012; 17:03 UT
Credential Certification: Francesco Verrecchia (francesco.verrecchia@asdc.asi.it)

Subjects: Gamma Ray, >GeV, AGN, Blazar, Transient

Referred to by ATel #: 4437, 4448, 5232

The AGILE satellite detected gamma-ray emission above 100 MeV from the position (l,b)=(60.25,42.60) +/- 0.5 deg (95% stat.) +/- 0.1 deg (syst.) (R.A., Dec.=248.44, 37.54 deg, J2000), positionally consistent with the flat spectrum radio quasar 4C +38.41 (also known as BZQ J1635+3808/3EG J1635+3813), and associated to the gamma-ray source 2FGL J1635.2+3810 included in the second Fermi catalog.

A maximum likelihood analysis of the AGILE-GRID data in the integration between 2012-09-15 22:00 UT and 2012-09-18 10:30 UT, gives a significance level of 6.5 sigma with a flux of (290 +/- 80) x 10^-8 ph/cm^-2/s^-1 (E > 100 MeV). A flare from this source was detected by Fermi-LAT on May 9, 2011 (ATel #3333), reporting a peak flux of (210 +/- 30) x 10^-8 ph/cm^-2/s^-1 (E > 100 MeV).

This measurement was obtained with AGILE observing a large portion of the sky in spinning mode.

Multifrequency observations of the blazar 4C +38.41 region are strongly encouraged.