LIGO-Virgo S190510g
GCN Circular 24437
Subject
LIGO-Virgo S190510g: AGILE MCAL observations
Date
2019-05-10T05:26:58Z (6 years ago)
From
Alessandro Ursi at INAF/IAPS <alessandro.ursi@gmail.com>
A. Ursi (INAF/IAPS), F. Verrecchia (SSDC, and INAF/OAR), M. Tavani
(INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini, G.
Piano (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 S190510g at T0 = 2019-05-10 02:59:39
(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 90% of the S190510g 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 S190510g localization region, from a minimum of 1.30E-06 erg
cm^-2 to a maximum of 3.22E-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.
GCN Circular 24457
Subject
LIGO-Virgo S190510g: AGILE GRID observations
Date
2019-05-10T16:27:22Z (6 years ago)
From
Francesco Verrecchia at ASDC <francesco.verrecchia@ssdc.asi.it>
F. Verrecchia (SSDC, and INAF-OAR), A. Ursi (INAF/IAPS), M. Tavani
(INAF/IAPS,
and Univ. Roma Tor Vergata), F. Lucarelli, C. Pittori (SSDC, and INAF-OAR),
M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), 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 S190510g at T0 = 2019-05-10
02:59:39.292 UTC (GCN #24442 including an updated localization) a
preliminary
analysis of the AGILE exposure at T0 showed that about 60% of the S190510g
90% c.l. localization region (LR) was exposed at off-axis angles between 25
and 75 deg by the Gamma-Ray Imaging Detector (GRID).
We performed an analysis of the GRID data in the energy range 50 MeV -
10 GeV
over three time intervals before and after T0, where good exposure of the
S190510g 90% c.l. LR was available. No candidate gamma-ray transient was
detected.
The following preliminary GRID 3-sigma upper limit (UL) values are obtained:
(T0 - 2s; T0 + 2s): from 7.4e-07 to 1.7e-06 erg cm^-2 s^-1
(T0 - 10s; T0 + 10s): from 1.5e-07 to 3.5e-07 erg cm^-2 s^-1
(T0; T0 + 100s): from 4.2e-08 to 1.8e-07 erg cm^-2 s^-1
An image of the AGILE-GRID exposure near T0 is available at the site
https://tools.ssdc.asi.it/ImgView/Agile/S190510g_d4s_FM_UL-E50bemod8
These measurements were obtained with AGILE observing a large portion of
the sky in spinning mode. Additional analysis of AGILE data is in progress.