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LIGO-Virgo S190412m

GCN Circular 24100

Subject
LIGO-Virgo S190412m: AGILE preliminary analysis
Date
2019-04-12T08:39:59Z (6 years ago)
From
Fabrizio Lucarelli at SSDC/INAF-OAR <fabrizio.lucarelli@ssdc.asi.it>
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.

GCN Circular 24103

Subject
LIGO-Virgo S190412m: Search for neutrino counterparts with IceCube
Date
2019-04-12T11:35:09Z (6 years ago)
From
Erik Blaufuss at U. Maryland/IceCube <blaufuss@umd.edu>
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."
------------------------------------------------------------------------------------

GCN Circular 24110

Subject
LIGO-Virgo S190412m: AGILE GRID observations
Date
2019-04-12T15:41:29Z (6 years ago)
From
Fabrizio Lucarelli at SSDC/INAF-OAR <fabrizio.lucarelli@ssdc.asi.it>
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), 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).

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.

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