TITLE:   GCN CIRCULAR
NUMBER:  39379
SUBJECT: GRB 250219A: Swift-XRT observations
DATE:    25/02/20 01:07:10 GMT
FROM:    Phil Evans at U of Leicester <pae9@star.le.ac.uk>

J. A. Kennea (PSU), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB),
M. Ferro (INAF-OAB), D.N. Burrows (PSU), M. A. Williams (PSU), S.
Dichiara (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester)
and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team:

Swift-XRT has performed follow-up observations of the
SVOM/ECLAIRs-detected burst GRB 250219A, collecting  323 s of Photon
Counting (PC) mode data between T0+4.9 ks and T0+11.3 ks. 

One uncatalogued X-ray source has been detected within the estimated
3-sigma SVOM/ECLAIRs error region (557 arcsec), 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 1:
  RA (J2000.0):  173.3707  =  11:33:28.97
  Dec (J2000.0): +22.7056  =  +22:42:20.2
  Error: 5.2 arcsec (radius, 90% conf.)
  Count-rate: 0.072 +/- 0.018 ct s^-1	
  Distance: 317 arcsec from SVOM/ECLAIRs position.
  Flux: (2.19 +/- 0.54)e-12 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/00021785.

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