TITLE: GCN CIRCULAR NUMBER: 21701 SUBJECT: LIGO/Virgo G299232: AGILE GRID observations DATE: 17/08/25 17:58:16 GMT FROM: Francesco Verrecchia at ASDC, INAF-OAR G. Piano, M. Cardillo (INAF/IAPS), F. Verrecchia (SSDC and INAF/OAR), M. Pilia (INAF/OA-Cagliari), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Bulgarelli (INAF/IASF-Bo), C. Pittori (SSDC and INAF/OAR), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), A. Ursi, G. Minervini, A. Argan, Y. Evangelista (INAF/IAPS), F. Lucarelli (ASDC and INAF/OAR), N. Parmiggiani, A. Zoli, V. Fioretti, F. Fuschino (INAF/IASF-Bo), A. Trois (INAF/OA-Cagliari) M. Marisaldi (INAF/IASF-Bo and Bergen University), A. Giuliani (INAF/IASF-Mi), report on behalf of the AGILE Team: In response to the LIGO/Virgo GW trigger event G299232 at T0 = 2017-08-25 13:13:37.983 UTC (GCN #21693), we performed an analysis of the AGILE Gamma-Ray Imaging Detector (GRID) data on different timescales. On LIGO/Virgo trigger time (T0) the GRID exposure covered nearly 42% of the LIGO/Virgo localization region (at 90% confidence level; LR), observed at off-axis angles between 20 and 55 deg. An analysis of the data in the energy range 50 MeV - 10 GeV was performed on timescales from 2 to 100 sec centered at T0. Preliminary values of 3-sigma upper limits (ULs) obtained within the accessible LIGO/Virgo 3-sigma LR are reported below: from 1.5e-06 to 7.8e-06 erg cm^-2 s^-1 for integration time of 2s from 1.5e-07 to 7.8e-07 erg cm^-2 s^-1 for integration time of 20s from 3.9e-08 to 2.2e-07 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 analysis of AGILE data is in progress.