GCN Circular 43255

Subject

The EP-WXT trigger 01709250693/GRB 251230A: Las Cumbres detection of the optical counterpart

Event

GRB 251230A

Date

2025-12-30T02:02:19Z (a day ago)

Edited On

2025-12-30T03:17:33Z (a day ago)

From

Wenxiong Li at NAOC <liwenxiong1992@gmail.com>

Edited By

Vidushi Sharma at NASA GSFC/UMBC <vidushi.sharma@nasa.gov> on behalf of Wenxiong Li at NAOC <liwenxiong1992@gmail.com>

Via

Web form

Wenxiong Li, Runduo Liang (NAOC), Iair Arcavi (TAU), Ido Keinan (TAU), David Sand (U of Arizona)
We observed the position of EP-WXT trigger 01709250693/GRB 251230A with a Las Cumbres 1m telescope at Sutherland Observatory, South Africa, 9 mins after the Einstein Probe WXT trigger. We took 2x300s exposures in the broad optical w band.

We find an uncataloged source at RA=179.8972, Dec=11.4383 within the EP-WXT error circle and measure the following preliminary photometry calibrated to the r band:
MJD 61039.063 Mag 15.1
The position of the counterpart is consistent with that reported by Lanava et al. (GCN 43252Loading...
 
 ).