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GCN 42934: EP251202a/trigger 01709249064: Las Cumbres discovery of the optical counterpart

2025-12-02T02:44:37.124Z | rev 3 | event: GRB 251202A
Wenxiong Li, Runduo Liang (NAOC), Iair Arcavi (TAU), Ido Keinan (TAU), David Sand (U of Arizona)
We observed the position of The EP-WXT trigger 01709249064 with a Las Cumbres 1m telescope at Teide Observatory, Tenerife, 18 mins after the Einstein Probe WXT trigger. We took 2x300s exposures in the broad optical w band.
We find a uncataloged source at RA=122.1143 Dec=40.6123 within the EP/WXT error circle and measure the following preliminary photometry calibrated to the r band:
MJD 61011.089 Mag 15.6
We find a faint red likely extended source at this position in Legacy Survey data (https://www.legacysurvey.org/viewer).
Additional followup is encouraged.