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GCN Circular 21525

Subject
LIGO/Virgo G298048: AGILE MCAL observations
Date
2017-08-17T22:01:26Z (7 years ago)
From
Francesco Verrecchia at ASDC, INAF-OAR <verrecchia@asdc.asi.it>
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.
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