[vsnet-grb-info 22902] LIGO/Virgo S190706ai: No counterpart candidates in AGILE-MCAL observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25001
SUBJECT: LIGO/Virgo S190706ai: No counterpart candidates in AGILE-MCAL observations
DATE:    19/07/07 00:04:04 GMT
FROM:    Fabrizio Lucarelli at SSDC/INAF-OAR  <fabrizio.lucarelli at ssdc.asi.it>

F. Lucarelli, C. Pittori (SSDC, and INAF/OAR), M. Tavani (INAF/IAPS, and Univ.
Roma Tor Vergata), M. Cardillo, C. Casentini, G. Piano, A. Ursi (INAF/IAPS), F.
Verrecchia (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 S190706ai at T0 = 2019-07-06 22:26:41.345 (UT),
a preliminary analysis of the AGILE minicalorimeter (MCAL) triggered data found no
event candidates within a time interval covering +/- 15 s from the LIGO/Virgo T0.

At the T0, about 54% of the S190706ai 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 S190706ai localization
region, from a minimum of 1.6E-06 erg cm^-2 to a maximum of 2.2E-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.