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GCN Circular 32547

Subject

GRB 220909A: Swift-XRT observations

Date

2022-09-12T05:51:40Z (3 years ago)

From

Phil Evans at U of Leicester <pae9@leicester.ac.uk>

M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC &
INAF-OAR), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), D.N. Burrows
(PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester) and P.A.
Evans (U. Leicester) report on behalf of the Swift-XRT team:

Swift-XRT has performed follow-up observations of the
Swift/BAT-GUANO-detected burst GRB 220909A, collecting 5.5 ks of Photon
Counting (PC) mode data between T0+216.5 ks and T0+235.1 ks. 

One uncatalogued X-ray source has been detected consistent with being
within 296 arcsec of the Swift/BAT-GUANO position (Raman et al, GCN
Circ. 32543Loading...
 
 ), it is below the RASS limit and shows no definitive signs
of fading. Therefore, at the present time we cannot confirm this as the
afterglow. Details of this source are given below:

Source 5:
  RA (J2000.0):  216.0407  =  14:24:9.76
  Dec (J2000.0): -8.8439  =  -08:50:37.9
  Error: 7.3 arcsec (radius, 90% conf.)
  Count-rate: (1.12 [+0.72, -0.53])e-3 ct s^-1	 
  Distance: 43 arcsec from Swift/BAT-GUANO position.

Seven uncatalogued sources were also detected too far from the GRB
position to be likely afterglow candidates.

The results of the XRT-team automatic analysis of the XRT observations,
including a position-specific upper limit calculator, are available at
https://www.swift.ac.uk/ToO_GRBs/00021513.

This circular is an official product of the Swift-XRT team.