TITLE: GCN CIRCULAR NUMBER: 7707 SUBJECT: GRB 080507: Swift XRT analysis confirms the X-ray afterglow DATE: 08/05/11 06:48:03 GMT FROM: Valentina La Parola at INAF-IASPA V. Mangano, B. Sbarufatti, V. LaParola, P. Romano (INAF-IASF PA) and W. H. Baumgartner (GSFC/UMBC) report on behalf of the Swift-XRT team: Swift started a second ToO observation of GRB 080507 (Lapshov et al., GCN Circ. 7697) on May 9th at 17:24 UT. We have analyzed the 4 ks PC observation, and found that the brightest uncatalogued source detected during the previous ToO observation (Mangano et al., GCN Circ. 7699) has decayed from a rate level of (1.4 +/- 0.2) e-2 counts s-1 to a level of (2.2 +/- 0.7) e-3 counts s-1. The second uncatalogued source in the SuperAGILE error circle is still visible at the constant level of (3.0 +/- 1.0) e-3 counts s-1. We can confirm that the brightest source detected in Mangano et al., GCN Circ. 7699 is the X-ray afterglow of GRB 080507, in agreement with the observation reported by Kann et al. (GCN 7705). This is an official product of the Swift-XRT team