GRB 220624A: AGILE/GRID refined analysis

he Gamma-Ray Imaging Detector (GRID) of AGILE detected gamma-ray transient emission consistent with the long GRB 220624A reported by Fermi/GBM (GCN #32256) at T0 = 2022-06-24 02:58:35 s (UTC), as already reported in Verrecchia et al. GCN #32261 and also detected by AGILE/MCAL (Ursi et al., GCN #32259). An improved localization has been reported by the IPN (Kozyrev et al. GCN #32265). A refined AGILE/GRID data analysis in the energy range 30 MeV - 10 GeV shows a detection with a statistical significance of about 10 sigma over a time integration of 20 s starting at the T0 of GRB 220624A, at a sky position with Galactic coordinates l=260 deg, b=75 deg, with and an error radius of 4 deg (90% statistical + systematic error; R.A.= 182 deg, Decl.= 16 deg (J2000)). The GRID error circle includes the IPN position. During the 20s integration, we detected a total of 41 events (3 background events estimated through a Li&Ma analysis), 17 events at energies above 100 MeV, and 3 events above 1 GeV. These measurements were obtained with AGILE observing a large portion of the sky in spinning mode. Additional analysis of AGILE data is in progress...