GCN Circular 32633
Subject
GRB 221008A: Swift-XRT observations
Date
2022-10-09T15:09:33Z (2 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P.
Osborne (U. Leicester), K.L. Page (U. Leicester), A. D'Ai
(INAF-IASFPA), A. Melandri (INAF-OAB), T. Sbarrato (INAF-OAB) and P.A.
Evans (U. Leicester) report on behalf of the Swift-XRT team:
Swift-XRT has performed follow-up observations of the MAXI-detected
burst GRB 221008A (Soejima et al. GCN Circ. 32630) in a series of
observations tiled on the sky. The total exposure time is 1.2 ks,
distributed over 4 tiles; the maximum exposure at a single sky location
was 466 s. The data were collected between T0+50.0 ks and T0+51.4 ks,
and are entirely in Photon Counting (PC) mode.
No uncatalogued X-ray sources have been detected. The 3-sigma upper
limit in the field (not including the regions where the tiles overlap)
ranges from ~0.03 to ~0.06 ct s^-1, corresponding to a 0.3-10 keV
observed flux of 1.1e-12 to 2.4e-12 erg cm^-2 s^-1 (assuming a typical
GRB spectrum).
A previously-catalogued X-ray source has been detected, however because
it is a catalogued object it is unlikely to be the afterglow.
The results of the XRT-team automatic analysis of the tiled XRT
observations, including a position-specific upper limit calculator, are
available at https://www.swift.ac.uk/xrt_products/TILED_GRB00109.
This circular is an official product of the Swift-XRT team.