The candidate gamma-ray transient AGL J1734-3310 in the Galactic plane.

ATel #2017; A. Bulgarelli, F. Gianotti, M. Trifoglio (INAF-IASF Bologna), E. Striani, M. Tavani (INAF-IASF Roma), S. Sabatini (INFN Roma-2), S. Vercellone (INAF-IASF Palermo), M. Feroci, F. Lazzarotto, E. Del Monte (INAF-IASF Roma), C. Pittori, F. Verrecchia (ASDC), A. Pellizzoni, M. Pilia (INAF-OACagliari), A. Chen, A. Giuliani (INAF-IASF Milano), F. D'Ammando, G. Piano, G. Pucella, V. Vittorini, E. Costa, I. Donnarumma, L. Pacciani, P. Soffitta, Y. Evangelista, I. Lapshov, M. Rapisarda, A. Argan, A. Trois, G. De Paris (INAF-IASF Roma), M. Marisaldi, G. Di Cocco, C. Labanti, F. Fuschino, M. Galli (INAF-IASF Bologna), P. Caraveo, S. Mereghetti, F. Perotti, M. Fiorini, A. Zambra (INAF-IASF Milano), G. Barbiellini, F. Longo, E. Moretti, E. Vallazza (INFN Trieste), P. Picozza, A. Morselli (INFN Roma-2), M. Prest (Universita` dell'Insubria), P. Lipari, D. Zanello (INFN Roma-1), P. Cattaneo (INFN Pavia), P. Santolamazza, S. Colafrancesco, P. Giommi (ASDC), L. Salotti (ASI).
on 17 Apr 2009; 18:23 UT
Distributed as an Instant Email Notice Request For Observations
Credential Certification: Stefano Vercellone (stefano@iasf-milano.inaf.it)

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During the current AGILE pointing centered near the Aquila field the Gamma-Ray Imaging Detector (GRID) detected a possible candidate gamma-ray transient.

Integrating from 2009-04-14 00:00 UT to 2009-04-15 00:00 UT, a preliminary maximum likelihood analysis for energies above 100 MeV shows a detection at a significance level above 4.5 sigma and a flux excess of about 350e-8 +/- 100 ph/cm2/s. The source is not detected at energies above 400 MeV.

The source positional error box is centered at Galactic coordinates l = 355.17 deg, b = -0.28 deg (R.A. = 17h 34m 44s, DEC = -33h 10m 38s ) and has a preliminary 1-day timescale 95% confidence radius of 0.65 degrees.

The candidate gamma-ray transient AGL J1734-3310 appears to be consistent in position with 1AGL J1736-3235 and also with the INTEGRAL unidentified source IGR J17354-3255.

A preliminary analysis of the Super-AGILE data over the same time period and the same sky region does not show any counterpart in the 20-60 keV energy range, with a 3-sigma upper limit of 40 mCrab on the average flux.

We strongly encourage multi-frequency observations of the AGL J1734-3310 field.