TITLE: GCN CIRCULAR NUMBER: 40123 SUBJECT: EP250407a: Swift-XRT observations DATE: 25/04/08 19:20:26 GMT FROM: Maia Williams at PSU mjw6837@psu.edu

M. A. Williams (PSU), S. Dichiara (PSU), K.L. Page (U. Leicester) and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team:

We have analyzed 2100 s of XRT data for the recently reported transient EP250407a (GCN #40118), from T0+36.5 ks to T0+42.4 ks after detection by Einstein Probe WXT. The data are entirely in Photon Counting (PC) mode.

No X-ray sources have been detected within the estimated 90% EP-WXT error region (2.5 arcmin), with an upper limit on count rate of 5.3 × 10^-3 ct/s. For a typical GRB-like spectrum, this equates to an upper limit on flux of 2 x 10^-13 erg/s/cm^2 (0.3-10 keV).

The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/EP/EP_FIELD00033/.

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