TITLE: GCN CIRCULAR NUMBER: 21605 SUBJECT: LIGO/Virgo G298389: AGILE MCAL observations DATE: 17/08/19 23:03:34 GMT FROM: Francesco Verrecchia at ASDC, INAF-OAR C. Pittori, F. Verrecchia (SSDC and INAF/OAR), M. Cardillo (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), G. Piano (INAF/IAPS), M. Pilia (INAF/OA-Cagliari), A. Ursi (INAF/IAPS), A. Bulgarelli (INAF/IASF-Bo), I. Donnarumma (ASI), F. Longo (Univ. Trieste and INFN Trieste), G. Minervini, A. Argan, Y. Evangelista (INAF/IAPS), F. Lucarelli (SSDC 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 event G298389 (T0 = 2017-08-19 15:50:46.990 UTC; GCN #21600), a preliminary analysis of the AGILE MiniCALorimeter (MCAL) data found no event candidates within a time interval covering approximately -/+ 10 sec from the LIGO/Virgo T0, due to Earth occultation. 3-sigma ULs were computed for a 1 s integration time on different celestial positions within the G298389 90% c.l. localization region, taking into consideration the nearest triggered data acquisition (about 85 sec before the T0), resulting in typical values of the fluence UL ranging from 5.4e^-7 erg cm^-2 to 6.3e^-7 erg cm^-2 (assuming as spectral model a power law with photon index 1.4). The AGILE-MCAL detector is a CsI detector with a 4-pi FoV, working in the range 0.4 - 100 MeV. Additional analysis of AGILE data is in progress.