TITLE:   GCN CIRCULAR
NUMBER:  20395
SUBJECT: LIGO/Virgo G268556: AGILE-GRID preliminary analysis
DATE:    17/01/07 17:24:45 GMT
FROM:    Francesco Verrecchia at ASDC, INAF-OAR  <verrecchia@asdc.asi.it>

M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), F. Verrecchia (ASDC and
INAF/OAR), G. Minervini (INAF/IAPS), A. Giuliani (INAF/IASF-Mi), A.
Bulgarelli, A. Zoli (INAF/IASF-Bo), C. Pittori (ASDC and INAF/OAR), I.
Donnarumma, P. Munar-Adrover, G. Piano (INAF/IAPS), F. Lucarelli (ASDC
and INAF/OAR), M. Cardillo (INAF/OA-Arcetri and INAF/IAPS), F. Longo (Univ.
Trieste and INFN Trieste), A. Ursi (INAF/IAPS), F. Fuschino (INAF/IASF-Bo),
Y. Evangelista (INAF/IAPS), M. Marisaldi (INAF/IASF-Bo and Bergen
University)(INAF/IAPS), A. Argan (INAF/IAPS),  M. Pilia, A. Trois
(INAF/OA-Cagliari), V. Fioretti (INAF/IASF-Bo), report on behalf of the
AGILE Team:

In response to the LIGO/Virgo GW trigger G268556 (Shawhan et al., GCN
#20364) we performed an analysis of the AGILE Gamma-Ray Imaging Detector
(GRID) data on different timescales. On LIGO trigger time (T0), the GRID
exposure covered about 40% of the LIGO localization region; this region
was observed with off-axis angles between 0 and 70 deg.

An analysis of the data in the energy range 30 MeV - 10 GeV was performed
on timescales from 2 to 1000 sec centered at T0.
Typical 3-sigma preliminary upper limits (UL) obtained within the
accessible G268556 localization region are reported below:

2.0e-06 erg cm^-2 s^-1 for integration time of 2s,
3.4e-08 erg cm^-2 s^-1 for integration time of 100s.

These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode.
Additional GRID data analysis on longer time intervals is in progress.