LIGO-Virgo S190412m

F. Lucarelli (SSDC, and INAF-OAR), G. Piano (INAF/IAPS), F. Verrecchia, C. Pittori
(SSDC, and INAF-OAR), M. Tavani (INAF/IAPS, and Univ. Roma Tor Vergata),
M. Cardillo, C. Casentini, A. Ursi (INAF/IAPS), A. Bulgarelli, 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 S190412m at T0 = 2019-04-12 05:30:44.17 (UT)
(GCN #24098
Loading...
 
 ), a preliminary analysis of the AGILE exposure at T0 showed that
the S190412m 90% c.l. localization region (LR) was occulted by the Earth (GCN #24100
Loading...
 
 ).

We performed an analysis of the AGILE Gamma-Ray Imaging Detector (GRID) data
in the energy range 30 MeV - 10 GeV, over two separate time intervals with good exposure
of the S190412m 90% LR, before and after T0.

The following preliminary GRID values of 3-sigma upper limits (UL) are obtained:

(T0 - 700s; T0 - 600s): from 4.2e-08 to 2.1e-07 erg cm^-2 s^-1. LR coverage: <20%.

(T0 + 1600s; T0 + 1800s): from 4.1e-08 to 2.3e-07 erg cm^-2 s^-1. LR coverage: ~70%.

These measurements were obtained with AGILE observing a large portion of the sky
in spinning mode.

The IceCube Collaboration (http://icecube.wisc.edu/) reports:

IceCube has performed a search for track-like muon neutrino events 
consistent with the sky localization of S190412m in a time range of 1000 
seconds centered on the alert event time (2019-04-12 05:22:24.166 UTC to 
2019-04-12 05:39:04.166 UTC) during which IceCube was collecting good 
quality data. No track-like events are found in spatial coincidence with 
the 90% spatial containment of S190412A calculated from the map 
circulated in the initial notice.

IceCube's sensitivity to point sources within the location spanned by 
the 90% spatial containment of S190412m ranges from
0.029 to 0.048 GeV cm^-2 in a 1000 second time window.

The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector 
operating at the geographic South Pole, Antarctica.
The IceCube realtime alert point of contact can be reached at 
roc@icecube.wisc.edu

-- 
------------------------------------------------------------------------------------
Erik Blaufuss               email: blaufuss@umd.edu
Department of Physics       http://icecube.umd.edu/~blaufuss
University of Maryland      Phone: 301-405-6077
College Park, MD 20742      Office: PSC 2208E
"Any chance collision, and I light up in the dark."
------------------------------------------------------------------------------------

F. Lucarelli (SSDC, and INAF-OAR). G. Piano, A. Ursi (INAF/IAPS), Tavani
(INAF/IAPS, and Univ. Roma Tor Vergata), M. Cardillo, C. Casentini (INAF/IAPS),
C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli, 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 S190412m at T0 = 2019-04-12 05:30:44.17 (UT),
a preliminary analysis of the AGILE exposure at T0 shows that
the S190412m 90% c.l. localization region was occulted by the Earth.

However, exposure of the field was obtained before and after T0. Additional
analysis of AGILE data is in progress.