GCN Circular 39248

T. Sbarrato (INAF-OAB), M. A. Williams (PSU), S. Dichiara (PSU), J.A.
Kennea (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester),
A.P. Beardmore (U. Leicester), P. D'Avanzo (INAF-OAB), M.G. Bernardini
(INAF-OAB) and P.A. Evans (U. Leicester) reports on behalf of the
Swift-XRT team:

Swift-XRT has performed follow-up observations of the
Fermi/LAT-detected burst GRB 250206A in a series of observations tiled
on the sky.  The total exposure time is  4.3 ks, distributed over 10
tiles; the maximum exposure at a single sky location in the tiling was
978 s. The data were collected between T0+162.0 ks and T0+179.3 ks, and
are entirely in Photon Counting (PC) mode. 

Three uncatalogued X-ray sources have been detected, 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 1:
  RA (J2000.0):  224.6223  =  14:58:29.34
  Dec (J2000.0): -62.7146  =  -62:42:52.5
  Error: 8.2 arcsec (radius, 90% conf.)
  Count-rate: 0.0205 [+0.0125, -0.0089] ct s^-1   
  Distance: 1996 arcsec from Fermi/LAT position.

Source 3:
  RA (J2000.0):  225.3635  =  15:01:27.23
  Dec (J2000.0): -62.3210  =  -62:19:15.4
  Error: 17.4 arcsec (radius, 90% conf.)
  Count-rate: (7.8 [+5.0, -3.6])e-3 ct s^-1   
  Distance: 236 arcsec from Fermi/LAT position.

Source 4:
  RA (J2000.0):  225.7331  =  15:02:55.95
  Dec (J2000.0): -62.5032  =  -62:30:11.4
  Error: 8.8 arcsec (radius, 90% conf.)
  Count-rate: (9.0 [+5.1, -3.7])e-3 ct s^-1   
  Distance: 1124 arcsec from Fermi/LAT position.

A catalogued source was also detected.

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_GRB00132.

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