GRB 221009A: LEIA X-ray Afterglow Detection
Abstract
LEIA (Lobster Eye Imager for Astronomy) has performed one follow-up observation of GRB 221009A detected by Swift/BAT (Dichiara et al., GCN 32632, Kennea et al., GCN 32635), Fermi-GBM (Lesage et al., GCN 32642, Veres et al., GCN 32636), Fermi-LAT (Bissaldi et al. GCN 32637, Pillera et al., GCN 32658), AGILE-MCAL (Ursi et al., GCN 32650), AGILE-GRID (Piano et al. GCN 32657), INTEGRAL SPI/ACS (Gotz et al., GCN 32660), Konus-Wind (Frederiks et al., GCN 32668), HEBS (Liu et al., GCN 32751), at a redshift of z = 0.151 (de Ugarte Postigo et al., GCN 32648; Castro-Tirado et al., GCN 32686). The pointed observation was conducted from 2022-10-12T05:31:48 to 2022-10-12T05:51:39 with a net exposure of 1012 s. The X-ray afterglow of GRB 221009A is detected at a significance of 4.9 sigma. Assuming an absorbed power-law model with a photon index of 2.0, a Galactic absorption of 5.4 x 10^21 cm^-2 (Willingale et al. 2013; GCN #32651), and an intrinsic absorption of 1.1 x 10^22 cm^-2 at a redshift of 0.151 (GCN #32648), the unabsorbed flux in the 0.5 - 4.0 keV band is (1.8+/-0.4) x 10^-10 ergs/cm^2/s. LEIA (Zhang et al, ApJL submitted) is a soft X-ray monitor (0.5 - 4.0 keV) with a FoV of 340 square degrees aboard the SATech-01 satellite of the CAS, launched on July 27, 2022. The above result is preliminary and the final result will be published elsewhere.
- Publication:
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GRB Coordinates Network
- Pub Date:
- October 2022
- Bibcode:
- 2022GCN.32767....1L