[vsnet-grb-info 24238] LIGO/Virgo S191204r: upper limits from AGILE-MCAL observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26337
SUBJECT: LIGO/Virgo S191204r: upper limits from AGILE-MCAL observations
DATE:    19/12/04 20:02:05 GMT
FROM:    Giovanni Piano at INAF-IAPS  <giovanni.piano at inaf.it>

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

In response to the LIGO/Virgo GW event S191204r at T0 = 2019-12-04
17:15:26.092 (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 S191204r 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 S191204r localization region, from a minimum of 2.0E-06 erg
cm^-2 to a maximum of 3.0E-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.