GRB 221009A (Swift J1913.1+1946): AGILE/GRID detection
Abstract
The GRID detector onboard the AGILE satellite detected the bright emission classified as GRB 221009A or Swift J1913.1+1946, reported by Swift BAT (GCN #32635) at T0 = 2022-10-09 13:16:59 (UTC), by Fermi GBM (GCNs # 32636, #31782), Fermi LAT (GCN #32637), IPN (GCN #32641), AGILE/MCAL (GCN #32650), Swift XRT (GCN #32651), and Swift UVOT (GCN #32656). Integrating from 2022-10-09 UT 13:16:59 (T0) to 2022-10-09 UT 14:16:59 (T0 + 1h), a preliminary multi-source likelihood analysis yields a detection with a significance of 42 sigma and a gamma-ray flux F(>100 MeV) = (1.11 +/- 0.08) x 10^-3 photons/cm^2/s, by adopting a power-law model with a (reference) photon index value of -2.1. The angular position of the gamma-ray event, as detected by the AGILE/GRID, is: (l, b) = (52.99, 4.26) +/- 0.17 deg (stat.) +/- 0.10 deg (syst.) 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.32657....1P