TITLE: GCN CIRCULAR NUMBER: 38867 SUBJECT: EP250109a: Swift/XRT non-detection DATE: 25/01/09 12:12:58 GMT FROM: Jamie Kennea at Penn State jak51@psu.edu

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

On 09:19:41UT Swift XRT began a 950s exposure of the field containing the recently reported transient EP250109a (GCN #38864), 3 hours after detection by Einstein Probe WXT. Examination of the XRT data does not reveal any new X-ray sources, with an upper limit on count rate of 0.01 c/s at the EP FXT position. For a typical GRB-like spectrum this equates to an upper limit on flux of 3 x 10^-13 erg/s/cm^2 (0.3-10 keV).

Although GCN #38864 does not report flux, the Swift/XRT non-detection suggests that this transient has rapidly faded.

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