AGILE detection of a gamma-ray source off the Galactic Plane
ATel #1199; A. Bulgarelli (INAF/IASF Bologna), S. Vercellone, A. Giuliani, A. Chen, S. Mereghetti, A. Pellizzoni, F. Perotti, F. Fornari, M. Fiorini, P. Caraveo, A. Zambra (INAF/IASF Milano), M. Tavani, G. Pucella, F. D'Ammando, V. Vittorini, E. Costa, M. Feroci, I. Donnarumma, L. Pacciani, E. Del Monte, F. Lazzarotto, P. Soffitta, Y. Evangelista, I. Lapshov, M. Rapisarda, A. Argan, A. Trois (INAF/IASF Roma), G. Barbiellini, F. Longo (INFN Trieste), G. Di Cocco, C. Labanti, F. Fuschino, M. Marisaldi, M. Galli, F. Gianotti, M. Trifoglio (INAF/IASF Bologna), P. Picozza, A. Morselli (INFN Roma-2), M. Prest, E. Vallazza (Universita` dell'Insubria), P. Lipari (INFN Roma-1) and P. Giommi, C. Pittori, L. A. Antonelli, D. Gasparrini, S. Cutini, F. Verrecchia (ASDC) and L. Salotti (ASI)
on 31 Aug 2007; 16:53 UT
Credential Certification: Stefano Vercellone (firstname.lastname@example.org)
Subjects: Gamma Ray, AGN, Quasar, Transient
The AGILE satellite, currently in its science performance
verification phase, during an observation centered near
the Galactic plane (l=334.44, b=10.06)
that started on 2007-08-27 12:00 UT, detected
significant gamma-ray emission from a source at approximately
33 degrees off the AGILE pointing direction.
A preliminary maximum likelihood analysis of the AGILE-GRID
(Gamma-Ray Imaging Detector) data obtained between
2007-08-27 14:48 UT and 2007-08-30 10:50 UT
for photon energies above 100 MeV results in a detection
significance of about 4 sigma.
The positional error box derived from our preliminary maximum
likelihood analysis (that does not, as yet, take into account
possible systematic effects) results in a 95% contour level
centered at the position l = 351.1, b = 39.7
with a radius of about 0.5 degrees.
We note that this position is marginally consistent with
the radio position of the blazar TXS 1510-089 that has
been associated with the gamma-ray source 3EG J1512-0849.
Considering that the in-flight calibration of the GRID is
still ongoing, and despite the preliminary GRID positioning
capability at substantial off-axis angles, we strongly encourage
multi-frequency observations of the field of the gamma-ray
source detected by AGILE.
The AGILE pointing of the Galactic plane region that includes
this gamma-ray source will continue until 2007-09-01 12:00 UT.