TITLE: GCN CIRCULAR NUMBER: 36731 SUBJECT: EP240618a: GSP optical upper limit DATE: 24/06/22 09:48:46 GMT FROM: Wenxiong Li liwenxiong1992@gmail.com
W. X. Li, S. J. Xue, (NAOC), M. Andrews, J. Farrah, 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 EP240618a by the Einstein Probe (Sun et al., GCN 36690), we initiated observations of the fast X-ray transient location starting on June 18 at 7:43 UT (~2 hours after the trigger) in the r band. These observations were conducted using the 1-meter telescope at the Las Cumbres Observatory node located at McDonald Observatory in USA. 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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