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GCN Circular 32847

Subject
GRB 221022A: Swift-XRT observations
Date
2022-10-25T14:45:14Z (2 years ago)
From
Phil Evans at U of Leicester <pae9@leicester.ac.uk>
J.P. Osborne (U. Leicester), E. Ambrosi  (INAF-IASFPA) , M. Capalbi
(INAF-IASFPA), M. Perri (SSDC & INAF-OAR), S. Dichiara (PSU), J.A.
Kennea (PSU), A. Tohuvavohu (U. Toronto), K.L. Page (U. Leicester),
A.P. Beardmore (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 221022A (Aaron Tohuvavohu et al. GCN
Circ. 32824), collecting 3.8 ks of Photon Counting (PC) mode data
between T0+170.9 ks and T0+184.2 ks. 

Six uncatalogued X-ray sources have been detected, however none of them
is above the RASS limit or shows definitive signs of fading. None of
the six is inside the GUANO error region. Therefore, at the present
time we cannot identify which, if any, is the afterglow. 
Details of these sources are given below:

Source 1:
  RA (J2000.0):  118.4349  =  07:53:44.38
  Dec (J2000.0): -5.2165  =  -05:12:59.3
  Error: 7.7 arcsec (radius, 90% conf.)
  Count-rate: (3.1 [+1.5, -1.2])e-3 ct s^-1   
  Distance: 489 arcsec from Swift/BAT-GUANO position.

Source 2:
  RA (J2000.0):  118.3560  =  07:53:25.45
  Dec (J2000.0): -5.2797  =  -05:16:47.0
  Error: 5.3 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (4.3 [+1.7, -1.4])e-3 ct s^-1   
  Distance: 588 arcsec from Swift/BAT-GUANO position.
  Flux: (1.12 [+0.45, -0.36])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)


Source 3:
  RA (J2000.0):  118.2368  =  07:52:56.83
  Dec (J2000.0): -5.2703  =  -05:16:13.1
  Error: 6.1 arcsec (radius, 90% conf.)
  Count-rate: (4.2 [+1.8, -1.4])e-3 ct s^-1   
  Distance: 668 arcsec from Swift/BAT-GUANO position.
  Flux: (2.14 [+0.91, -0.72])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)


Source 4:
  RA (J2000.0):  118.4804  =  07:53:55.29
  Dec (J2000.0): -5.1253  =  -05:07:31.0
  Error: 6.9 arcsec (radius, 90% conf.)
  Count-rate: (1.65 [+1.13, -0.80])e-3 ct s^-1	 
  Distance: 497 arcsec from Swift/BAT-GUANO position.

Source 5:
  RA (J2000.0):  118.1854  =  07:52:44.49
  Dec (J2000.0): -5.2601  =  -05:15:36.4
  Error: 4.1 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: (5.9 [+2.1, -1.7])e-3 ct s^-1   
  Distance: 761 arcsec from Swift/BAT-GUANO position.
  Flux: (2.22 [+0.79, -0.64])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)


Source 6:
  RA (J2000.0):  118.3078  =  07:53:13.87
  Dec (J2000.0): -5.2740  =  -05:16:26.4
  Error: 6.6 arcsec (radius, 90% conf.)
  Count-rate: (5.0 [+2.4, -1.8])e-3 ct s^-1   
  Distance: 578 arcsec from Swift/BAT-GUANO position.
  Flux: (1.01 [+0.47, -0.37])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)


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/00021530.

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