GCN Circular 25498
Subject
LIGO/Virgo S190828j: No counterpart candidates in AGILE-MCAL observations
Date
2019-08-28T07:49:25Z (5 years ago)
From
Francesco Longo at U of Trieste,INFN Trieste <franzlongo1969@gmail.com>
F. Longo (Univ. Trieste, and INFN Trieste), C. Pittori, F. Verrecchia
(SSDC, and
INAF/OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo,
C. Casentini, G. Piano, A. Ursi (INAF/IAPS), F. Lucarelli (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 S190828j at T0 = 2019-08-28
06:34:05.756 (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 40% of the S190828j 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
S190828j
localization region, from a minimum of 1.55E-06 erg cm^-2 to a maximum of
7.31E-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.