TITLE: GCN CIRCULAR NUMBER: 39437 SUBJECT: EP250223a: Swift/XRT localization DATE: 25/02/23 21:48:18 GMT FROM: Jamie Kennea at Penn State jak51@psu.edu

J. A. Kennea, C. Gronwall (PSU) and P. A. Evans (Leicester) report on behalf of the Swift Team:

At 16:36:15UT Swift began a target-of-opportunity observation of the transient EP250223a (GCN #39429), approximately 1.6 hours after the Einstein Probe trigger. We detect an an uncatalogued point source above the RASS limit at the following location: RA/Dec(J2000) = 98.27464, -22.4449, which is equivalent to:

RA(J2000) = 06h 33m 05.91s, Dec(J2000) = -22° 26′ 41.8″,

with an estimated uncertainty radius of 3.8 arc-seconds (90% confidence). This position lies 8.5 arc-seconds from the EP WXT position reported in GCN #39429. The peak flux during the XRT observation was 5.4 (±1.0) × 10^-12 erg cm^-2 s^-1 (0.3 - 10 keV).

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