TITLE: GCN CIRCULAR NUMBER: 40383 SUBJECT: EP#01709175213/IGR J19566+0326: Swift-XRT detection DATE: 25/05/07 14:44:00 GMT FROM: Maia Williams at PSU mjw6837@psu.edu

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

We have analyzed 1100 s of XRT data for the recently reported Einstein Probe (EP) trigger 01709175213 (GCN #40375), from T0+2.8 ks to T0+9.1 ks after detection by EP-WXT. The data are entirely in Photon Counting (PC) mode.

We detect an X-ray source within the estimated 90% C.L. EP-WXT error region. Using 1135 s of XRT PC mode data and 2 UVOT images, we find an enhanced XRT position: RA, Dec = 299.16259, 3.44549 which is equivalent to:

RA (J2000): 19h 56m 39.02s Dec (J2000): +03° 26′ 43.8′′

with an uncertainty of 2.5 arcsec (radius, 90% confidence).

This position is 46 arcsec from the EP-WXT position, and consistent with the X-ray source found in EP-FXT data. As noted by Sun et al. (GCN #40375), this position is consistent with the LMXB IGR J19566+0326/MAXI J1957+032.

The source has a peak count rate of 14.76 (±0.23) ct/s (0.3-10 keV). The mean count rate from the LSXPS catalogue is 0.1240 (±0.0019) ct/s, suggesting this source is an outburst of IGR J19566+0326.

The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/EP/EP_FIELD00037/.

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