LIGO/Virgo S200219ac: upper limits from AGILE/MCAL observations
Abstract
In response to the LIGO/Virgo GW event S200219ac at T0 = 2020-02-19 09:44:15.195 (UT), a preliminary analysis of the AGILE minicalorimeter (MCAL) triggered data found no significant event candidates within a time interval covering -/+ 15 sec from the LIGO/Virgo T0. At the T0, about 60% of the S200219ac 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 S200219ac localization region, from a minimum of 1.6E-06 erg cm^-2 to a maximum of 7.2E-06 erg cm^-2 (assuming as spectral model a single power law with photon index 1.5). An independent procedure based on photon counting statistics provides UL fluences in the range 0.4-1 MeV, for a 300 µs integration time, from a minimum of 1.4E-8 erg cm^-2 to a maximum of 4.4E-8 erg cm^-2. 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.
- Publication:
-
GRB Coordinates Network
- Pub Date:
- February 2020
- Bibcode:
- 2020GCN.27136....1U