GCN Circular 24572

A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), G. Piano
(INAF/IAPS), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M.
Cardillo, C. Casentini (INAF/IAPS), F. Lucarelli, C. Pittori (SSDC, and
INAF/OAR) , A. Bulgarelli, V. Fioretti, 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 S190517h at T0 = 2019-05-17 05:51:01
(UT), a preliminary analysis of the AGILE MiniCALorimeter (MCAL) triggered
data found no event candidates within a time interval covering -/+ 15 sec
from the LIGO/Virgo T0.

At the T0, about 55% of the S190517h 90% c.l. localization region was
accessible to the AGILE MCAL. Three-sigma upper limits (ULs) are obtained
for a 1 s integration time at different celestial positions within the
accessible S190517h localization region, from a minimum of 1.62E-06 erg
cm^-2 to a maximum of 2.73E-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.