[vsnet-grb-info 23068] LIGO/Virgo S190727h: No counterpart candidates in AGILE-MCAL observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  25167
SUBJECT: LIGO/Virgo S190727h: No counterpart candidates in AGILE-MCAL observations
DATE:    19/07/27 10:33:03 GMT
FROM:    Alessandro Ursi at INAF/IAPS  <alessandro.ursi at gmail.com>

A. Ursi (INAF/IAPS), M. Pilia (INAF/OA-Cagliari), M. Tavani (INAF/IAPS, and
Univ. Roma Tor Vergata),
M. Cardillo, C. Casentini, G. Piano (INAF/IAPS), C.Pittori, F. Lucarelli,
F. Verrecchia (SSDC, and INAF/OAR),
A. Bulgarelli, V. Fioretti, N. Parmiggiani (INAF/OAS-Bologna), F. Longo
(Univ. Trieste, and INFN Trieste)
report on behalf of the AGILE Team:

In response to the LIGO/Virgo GW event S190727h at T0 = 2019-07-27 06:03:33
UTC (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 80% of the S190727h 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 S190727h
localization
region, from a minimum of 1.6E-06 erg cm^-2 to a maximum of 7.4E-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.