{
  "bibcode": "2022GCN.32767....1L",
  "body": "Y. Liu, C. Zhang, Z.X. Ling, H.Q. Cheng, C.Z. Cui, D.W. Fan, H.B. Hu,\n\nM.H. Huang, C.C. Jin, D.Y. Li, H.Y. Liu, H. Sun, H.W. Pan, W.X. Wang,\n\nY.F. Xu, M. Zhang, W.D. Zhang, D.H. Zhao, and W. Yuan (NAOC, CAS),\n\nreport on behalf of the LEIA and Einstein Probe team:\n\n \n\nLEIA (Lobster Eye Imager for Astronomy) has performed one\n\nfollow-up observation of GRB 221009A detected by Swift/BAT\n\n(Dichiara et al., GCN 32632, Kennea et al., GCN 32635), Fermi-GBM\n\n(Lesage et al., GCN 32642, Veres et al., GCN 32636), Fermi-LAT\n\n(Bissaldi et al. GCN 32637, Pillera et al., GCN 32658), AGILE-MCAL\n\n(Ursi et al., GCN 32650), AGILE-GRID (Piano et al. GCN 32657),\n\nINTEGRAL SPI/ACS (Gotz et al., GCN 32660), Konus-Wind\n\n(Frederiks et al., GCN 32668), HEBS (Liu et al., GCN 32751), at a \n\nredshift of z = 0.151 (de Ugarte Postigo et al., GCN 32648; \n\nCastro-Tirado et al., GCN 32686).\n\n \n\nThe pointed observation was conducted from 2022-10-12T05:31:48\n\nto 2022-10-12T05:51:39 with a net exposure of 1012 s. The X-ray\n\nafterglow of GRB 221009A is detected at a significance of 4.9 sigma.\n\nAssuming an absorbed power-law model with a photon index of 2.0,\n\na Galactic absorption of 5.4 x 10^21 cm^-2 (Willingale et al. 2013;\n\nGCN #32651), and an intrinsic absorption of 1.1 x 10^22 cm^-2 at a\n\nredshift of 0.151 (GCN #32648), the unabsorbed flux in the 0.5 - 4.0 keV\n\nband is (1.8+/-0.4) x 10^-10 ergs/cm^2/s.\n\n \n\nLEIA (Zhang et al, ApJL submitted) is a soft X-ray monitor (0.5 - 4.0 keV)\n\nwith a FoV of 340 square degrees aboard the SATech-01 satellite of the CAS,\n\nlaunched on July 27, 2022. The above result is preliminary and the final\n\nresult will be published elsewhere.",
  "circularId": 32767,
  "createdOn": 1665886865000,
  "email": "ep_ta@bao.ac.cn",
  "subject": "GRB 221009A: LEIA X-ray Afterglow Detection",
  "submitter": "LEIA Team at NAOC/CAS  <ep_ta@bao.ac.cn>",
  "eventId": "GRB 221009A"
}