TITLE:   GCN CIRCULAR
NUMBER:  39527
SUBJECT: EP250228a: Swift/XRT localisation
DATE:    25/02/28 10:52:50 GMT
FROM:    K.L. Page at U Leicester <klp5@leicester.ac.uk>

K.L. Page, P.A. Evans (U.Leicester) and J. DeLaunay (PSU) report on
behalf of the Swift XRT Team:

On 2025 February 28, at 05:53 UT, Swift obtained an Target of Opportunity
observation of EP250228a (GCN Circ. 39525), collecting ~340 s of data
around 1.9 hr after the Einstein Probe trigger. The XRT data show an
uncatalogued X-ray source, consistent with the FXT source reported by the
EP team, at a position of RA, Dec = 103.60631, -41.57160, which is
equivalent to

RA (J2000): 06h 54m 25.51s
Dec (J2000): -41d 34′ 17.8″

with an uncertainty of 4.4 arcsec (radius, 90% confidence). The flux of
this source was (5.4 +/- 0.9) x 10^-12 erg cm^-2 s^-1 (0.3 - 10 keV).