TITLE: GCN CIRCULAR NUMBER: 21525 SUBJECT: LIGO/Virgo G298048: AGILE MCAL observations DATE: 17/08/17 22:01:26 GMT FROM: Francesco Verrecchia at ASDC, INAF-OAR M. Pilia (INAF/OA-Cagliari), M. Cardillo, G. Piano (INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata) F. Verrecchia (SSDC and INAF/OAR), 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 (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 G298048 at T0 = 2017-08-17 12:41:04.446 UTC, a preliminary analysis of the AGILE MiniCALorimeter (MCAL) data found no event candidates within a time interval covering approximately -/+ 10 sec from the LIGO T0. Due to Earth occultation the MCAL field of view did not cover the new revised HLV G298048 90% localization region (GCN #21513). At T0 MCAL exposed about 10% of the Fermi-GBM 3-sigma localization region (GCN #21506, T0_GBM=2017-08-17T12:41:06.47 UTC) . The closest in time MCAL triggered data acquisition occurred about 7 sec after the Fermi-GBM trigger, resulting in typical values of the fluence 3-sigma UL ranging from 5.2 e^-7 erg cm^-2 to 6.3 e^-7 erg cm^-2 (assuming a power law spectral model with photon index1.4 and 1 sec integration time). 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.