TITLE:   GCN CIRCULAR
NUMBER:  43630
SUBJECT: GRB 260206A: Swift-XRT observations
DATE:    26/02/07 14:08:50 GMT
FROM:    Phil Evans at U of Leicester <pae9@star.le.ac.uk>

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

Swift-XRT has performed follow-up observations of the MAXI-detected
burst GRB 260206A (Negoro et al. GCN Circ. 43624) in a series of
observations tiled on the sky.	The total exposure time is  1.6 ks,
distributed over 5 tiles; the maximum exposure at a single sky location
in the tiling was 787 s. The data were collected between T0+32.1 ks and
T0+38.5 ks, and are entirely in Photon Counting (PC) mode. 

One uncatalogued X-ray source has been detected, with a rank of
"reasonable" (i.e. a ~2 sigma detection); however, it is neither above
historical upper limits nor shows evidence of fading. Therefore, at the
present time we cannot say whether or not it is the afterglow. The
source details are:

Source 3:
  RA (J2000.0):  78.4839  =  05h 13m 56.13s
  Dec (J2000.0): -40.5311  =  -40d 31' 51.8"
  Error: 6.7 arcsec (radius, 90% conf.)
  Count-rate: 0.0117 [+0.0077, -0.0055] ct s^-1   
  Distance: 523 arcsec from MAXI position.

Two catalogued sources were also detected, including the LMXB 4U
0513-40 noted by Negoro et al. (GCN Circ. 43624); as well two 'poor'
sources (~1 sigma detections).


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_GRB00142.

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