TITLE: GCN CIRCULAR NUMBER: 41557 SUBJECT: EP250827a: Gemini-South redshift z = 1.613 DATE: 25/08/27 09:24:15 GMT FROM: Jonathan Quirola at Radboud University <jaquirola1990@gmail.com> A. J. Levan (Radboud and Warwick), J. A. Quirola-Vasquez (Radboud), P. G. Jonker (Radboud), G. Corcoran (UCD), D. B. Malesani (DAWN/NBI and Radboud), R. A. J. Eyles-Ferris (Leicester), A. Martin-Carrillo (UCD), report on behalf of a larger collaboration: We observed the location of the optical counterpart (Levan et al., GCN 41554) to EP250827a (Hua et al., GCN 41553) with Gemini-South and the GMOS instrument using the B480 grating and a 1 arcsec slit. Four 300 s exposures were obtained. Observations began on 2025 Aug 27 at 08:51 UT, approximately 71 min after the EP trigger time. The data was reduced using DRAGONS. Several metallic absorption lines (due to e.g. Fe II and Mg II) at a redshift of z = 1.613 are present, suggesting the FXT lies at this redshift or beyond. We thank the staff of Gemini, especially K. Silva, for their outstanding work in rapidly obtaining these observations. View this GCN Circular online at https://gcn.nasa.gov/circulars/41557. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...