LIGO/Virgo S200224ca: upper limits from AGILE/MCAL observations
Abstract
In response to the LIGO/Virgo GW event S200224ca at T0 = 2020-02-24 22:22:34.378 (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, the S200224ca 90% c.l. localization region (LR) was totally 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 S200224ca LR, from a minimum of 2.17E-06 erg cm^-2 to a maximum of 6.32E-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 us integration time, from a minimum of 1.44E-08 erg cm^-2 to a maximum of 4.39E-08 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.27187....1U