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GCN Circular 33348

GRB 230217A: Swift-XRT observations
2023-02-19T07:48:15Z (a year ago)
Phil Evans at U of Leicester <>
M. Capalbi (INAF-IASFPA), J.A. Kennea (PSU), A. Tohuvavohu (U.
Toronto), D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore
(U. Leicester), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR)
and M. J. Moss (GWU) report on behalf of the Swift-XRT team:

We have analysed 4.8 ks of Photon Counting (PC) mode XRT data for the
Swift-BAT-detected burst GRB 230217A (Moss et al. GCN Circ. 33339),
collected between T0+45.8 ks and T0+84.4 ks. 

Two uncatalogued X-ray sources have been detected consistent with being
within 296 arcsec of the Swift-BAT position, however none of them is
above the RASS limit or shows definitive signs of fading. Therefore, at
the present time we cannot identify which, if any, is the afterglow.
Details of these sources are given below:

Source 3:
  RA (J2000.0):  280.7700  =  18:43:4.80
  Dec (J2000.0): -28.8374  =  -28:50:14.6
  Error: 4.7 arcsec (radius, 90% conf. [Enhanced position])
  Count-rate: 0.0144 [+0.0022, -0.0021] ct s^-1   
  Distance: 67 arcsec from Swift-BAT position.
  Flux: (6.48 [+0.98, -0.94])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV)

Source 5:
  RA (J2000.0):  280.7763  =  18:43:6.30
  Dec (J2000.0): -28.7796  =  -28:46:46.7
  Error: 6.4 arcsec (radius, 90% conf.)
  Count-rate: (1.43 [+0.85, -0.64])e-3 ct s^-1	 
  Distance: 275 arcsec from Swift-BAT position.

Six 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

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