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GCN Circular 21605

Subject
LIGO/Virgo G298389: AGILE MCAL observations
Date
2017-08-19T23:03:34Z (7 years ago)
From
Francesco Verrecchia at ASDC, INAF-OAR <verrecchia@asdc.asi.it>
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.
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