TITLE: GCN CIRCULAR NUMBER: 24180 SUBJECT: LIGO-Virgo S190425z: AGILE MCAL observation DATE: 19/04/25 13:14:38 GMT FROM: Claudio Casentini at INAF-IAPS C.Casentini, G.Piano (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M.Cardillo, A.Ursi (INAF/IAPS), F. Lucarelli, C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, N. Parmiggiani (INAF/OAS-Bologna), M. Pilia (INAF/OA-Cagliari), F. Longo (Univ. Trieste, and INFN Trieste) report on behalf of the AGILE Team: In response to the LIGO-Virgo GW event S190425z at T0 = 2019-04-25 08:18:05 (UT), a preliminary analysis of the AGILE minicalorimeter (MCAL) data found no event candidates within a time interval covering +/- 100 sec from the LIGO-Virgo T0. Three-sigma upper limits (ULs) are obtained for a 1 s integration time at different celestial positions within the accessible S190425z 90% c.l. localization region (with R.A. in the approximate range between 1 - 8 hr), from a minimum of 1.25E-06 erg cm^-2 to a maximum of 7.99E-06 erg cm^-2 (assuming as spectral model a single power law with photon index 1.5). The AGILE-MCAL detector is a CsI detector with a 4 pi FoV, sensitive in the energy range 0.4-100 MeV. Additional analysis of AGILE data is in progress. ======================================= Dr. Claudio Casentini, PhD INAF IAPS - Istituto di Astrofisica e Planetologia Spaziali Via del Fosso del Cavaliere 100 00133 Roma, Italy Tel: (+39)3392319601 Email: claudio.casentini@roma2.infn.it Email: claudio.casentini@inaf.it Email/Skype: clavdio89@hotmail.it