[vsnet-grb-info 22427] LIGO/Virgo S190513bm: AGILE MCAL observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  24526
SUBJECT: LIGO/Virgo S190513bm: AGILE MCAL observation
DATE:    19/05/13 22:49:51 GMT
FROM:    Claudio Casentini at INAF-IAPS  <claudio.casentini at inaf.it>

C.Casentini (INAF/IAPS), F.Lucarelli (SSDC, and INAF/OAR), M. Tavani
(INAF/IAPS, and Univ. Roma Tor Vergata), M.Cardillo, G.Piano, A.Ursi
(INAF/IAPS), C. Pittori, F. Verrecchia (SSDC, and INAF/OAR), A. Bulgarelli,
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 S190513bm at T0 = 2019-05-13
20:54:28 (UT), a preliminary analysis of the AGILE minicalorimeter (MCAL)
triggered data found no event candidates within a time interval covering
+/- 100 sec from the LIGO-Virgo T0.

Three-sigma upper limits (ULs) are obtained for a 1 s integration time at
different celestial positions within the accessible S190513bm 90% c.l.
localization region (almost 80% of the given GW contour), from a minimum of
8.54E-07 erg cm^-2 to a maximum of 1.73E-06 erg cm^-2  (assuming as
spectral model a single power law with photon index 1.5). The average
off-axis angle is almost 90 degrees.

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.