TITLE: GCN CIRCULAR NUMBER: 25884 SUBJECT: LIGO/Virgo S190930s: no counterpart candidates in AGILE-GRID observations DATE: 19/09/30 17:06:48 GMT FROM: Martina Cardillo at INAF-IAPS LIGO/Virgo S190930s: no counterpart candidates in AGILE-GRID observations M. Cardillo (INAF/IAPS),  F. Verrecchia (SSDC, and INAF/OAR), F. Longo (Univ. Trieste, and INFN Trieste), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), C. Casentini, G. Piano, A. Ursi (INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari),  report on behalf of the AGILE Team: In response to the LIGO/Virgo GW event S190930s at T0 = 2019-09-30 13:35:41 (UT), a preliminary analysis of the AGILE exposure at T0 shows that the Gamma-Ray Imaging Detector (GRID) exposure covered about 27% of the 90% c.l. localization region (LR) (40% of 90% c.l. LR is occulted by Earth) at an off-axis angle of about 5 degrees. We performed an analysis of the GRID data in the energy range 50 MeV - 10 GeV on T0, where good exposure of the S190930s 90% c.l. LR was available. No candidate gamma-ray transient was detected. The following preliminary GRID values of 3-sigma upper limit (UL) are obtained: - from 1.0e-06 to 4.9e-06 erg cm^-2 s^-1, with exposure of about 27% of the LR over the time interval ( T0 -2s ; T0 + 2s ); - from 8.4e-07 to 2.5e-06 erg cm^-2 s^-1, with exposure of about 26% of the LR over the time interval ( T0s ; T0 + 10s ); - from 1.4e-07 to 1.6e-06 erg cm^-2 s^-1, with exposure of about 26% of the LR over the time interval ( T0 ; T0 + 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.