[vsnet-grb-info 24256] LIGO/Virgo S191205ah: upper limits from AGILE-MCAL observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26355
SUBJECT: LIGO/Virgo S191205ah: upper limits from AGILE-MCAL observations
DATE:    19/12/05 23:31:24 GMT
FROM:    Francesco Verrecchia at ASDC  <francesco.verrecchia at ssdc.asi.it>

F. Verrecchia, 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. Lucarelli,  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 S191205ah at T0 = 2019-12-05
21:52:08.569 (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 S191205ah 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 S191205ah localization region, from a minimum of 1.6E-06 erg
cm^-2 to a maximum of 7.3E-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.