TITLE: GCN CIRCULAR NUMBER: 39627 SUBJECT: EP250308a: GSP optical upper limit DATE: 25/03/09 05:36:15 GMT FROM: Wenxiong Li at NAOC liwenxiong1992@gmail.com
W. X. Li, S. J. Xue (NAOC), M. Andrews, J. Farah, D. A. Howell, M. Newsome, E. Padilla Gonzalez, C. McCully, and G. Terreran (Las Cumbres Observatory), on behalf of a larger collaboration, report: Following the detection of the fast X-ray transient EP250308a by the Einstein Probe (trigger ID: 01709132392; Yin et al., GCN 39625), we initiated observations of its location starting on 2025 March 9th at 05:07 UT (~12 hours after the EP/WXT trigger) in the i band. These observations were conducted using the 1-meter telescope at the Las Cumbres Observatory node located at Cerro Tololo Inter-American Observatory in Chile. No new optical source was detected in the co-added images within the EP/FXT error box down to ~21.5 mag. These observations were taken as part of the Global Supernova Project.
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