[vsnet-grb-info 22624] LIGO/Virgo S190602aq: Upper limits from AGILE-GRID observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24723
SUBJECT: LIGO/Virgo S190602aq: Upper limits from AGILE-GRID observations
DATE:    19/06/02 23:37:01 GMT
FROM:    Francesco Verrecchia at ASDC  <francesco.verrecchia at ssdc.asi.it>

F. Verrecchia (SSDC, and INAF-OAR), C. Casentini (INAF/IAPS), M. Tavani
(INAF/IAPS,
and Univ. Roma Tor Vergata), F. Lucarelli, C. Pittori (SSDC, and
INAF-OAR), M.
Cardillo, G. Piano A. Ursi (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 S190602aq at T0 = 2019-06-02 17:59:27.089
UTC (GCN #24717) a preliminary analysis of the AGILE exposure at T0 showed
 that
the S190602aq 90% c.l. localization region (LR) was not exposed by the Gamma-Ray
Imaging Detector (GRID). The closest exposure in time occurred at T0+100s
covering
about 100% of the LR at off-axis angles between 20 and 70 deg.

We performed an analysis of the GRID data in the energy range 50 MeV - 10 GeV
over a single time interval after T0, when good exposure of
the S190602aq 90% c.l. LR was available. The following preliminary GRID 3-sigma upper limit (UL) values
are obtained over a large area of the exposed LR:
(T0+100s; T0+200s): from 3.0e-08 to 4.7e-07 erg cm^-2 s^-1

An image of the AGILE-GRID 100s exposure near T0 is available at the site
https://tools.ssdc.asi.it/ImgView/Agile/S190602aq_T0+100s_d100s_FM_UL-E50la17

These measurements were obtained with AGILE observing a large portion of
the sky in
spinning mode. Additional analysis of AGILE data is in progress.