TITLE:   GCN CIRCULAR
NUMBER:  39633
SUBJECT: GRB 230509B: Tiled Swift observations
DATE:    25/03/09 13:15:21 GMT
FROM:    Phil Evans at U of Leicester <pae9@star.le.ac.uk>


P. A. Evans (U. Leicester) reports on behalf of the Swift team:

Swift has initiated a series of observations, tiled on the sky, of the
location of the Fermi/GBM GRB 250309B and IceCube-250309A. Automated analysis of
the XRT data will be presented online at
http://www.swift.ac.uk/xrt_products/TILED_GRB00134

Any uncatalogued X-ray sources detected in this analysis will be
reported on this website and via GCN COUNTERPART notices. The probability of finding
serendipitous sources, unrelated to the Fermi/GBM event is high: any X-ray source
considered to be a probable afterglow candidate will be reported via a GCN Circular
after manual consideration.

Details of the XRT automated analysis methods are detailed in Evans et
al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8).

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