GRB 221023A: AGILE/GRID analysis
Abstract
The Gamma-Ray Imaging Detector (GRID) of AGILE detected gamma-ray transient emission consistent with the long GRB 221023A reported by AGILE/MCAL (GCN #32825) at T0 = 2022-10-23 20:41:34 s (UTC), also detected by Fermi/GBM (GCN #32826, #32845), Fermi/LAT (GCN #82831) and Konus-Wind (GCN #32849). A refined AGILE/GRID data analysis in the energy range 30 MeV - 10 GeV shows a detection with a statistical significance of about 4.3 sigma overa time integration of 50 s starting at the T0 of GRB 221023A, at a sky position with Galactic coordinates l=28 deg, b=53 deg, with and an error radius of 4 deg (90% statistical + systematic error; R.A.= 232 deg, Decl.= 19 deg (J2000)). The GRID error circle includes the LAT position. During the 120s integration, we detected a total of 22 events (11 background events estimated through a Li&Ma analysis), 16 events at energies above 100 MeV, and 2 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.
- Publication:
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GRB Coordinates Network
- Pub Date:
- October 2022
- Bibcode:
- 2022GCN.32856....1V