TITLE: GCN CIRCULAR NUMBER: 21482 SUBJECT: LIGO/Virgo G297595: AGILE GRID observations DATE: 17/08/14 19:21:29 GMT FROM: Francesco Verrecchia at ASDC, INAF-OAR F. Longo (Univ. Trieste and INFN Trieste), F. Verrecchia (SSDC and INAF/OAR), G. Piano (INAF/IAPS), M. Pilia (INAF/OA-Cagliari), C.Pittori (SSDC and INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), A. Ursi, M. Cardillo, A. Giuliani (INAF/IASF-Mi), A. Bulgarelli, N. Parmiggiani, A.Zoli, V.Fioretti (INAF/IASF-Bo), I. Donnarumma (ASI), A. Giuliani (INAF/IASF-Mi), F. Lucarelli (ASDC and INAF/OAR), G. Minervini (INAF/IAPS), F. Fuschino (INAF/IASF-Bo), Y. Evangelista (INAF/IAPS), M. Marisaldi (INAF/IASF-Bo and Bergen University), A. Argan (INAF/IAPS), A. Trois (INAF/OA-Cagliari) report on behalf of the AGILE Team: In response to the LIGO/Virgo GW trigger G297595 (GCN #21474), we performed an analysis of the AGILE Gamma-Ray Imaging Detector (GRID) data on different timescales. On LIGO/VIRGO trigger time (T0=2017-08-14 10:30:43.527 UTC) the GRID exposure has no coverage of the LIGO/VIRGO localization region (LR) due to Earth occultation, from bayestar.fits.gz skymap in the GraceDB. Data analysis in the energy range 50 MeV - 10 GeV was performed only at times when the source region was not occulted by the Earth, from T0+500 to T0+600 sec, when the AGILE-GRID exposure partially covered the LR (about 70% of it, observed at off-axis angles between 0 and 42 deg). Preliminary values of 3-sigma upper limits (UL) obtained within the accessible G297595 LR are from 3.1e-08 to 3.9e-08 erg cm^2 s^-1. These ULs apply to a large fraction of the GRID-exposed LIGO LR. These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress.