TITLE:   GCN CIRCULAR
NUMBER:  41555
SUBJECT: EP250827a: Las Cumbres independent detection of the optical counterpart
DATE:    25/08/27 09:02:44 GMT
FROM:    Wenxiong Li at NAOC <liwenxiong1992@gmail.com>


Wenxiong Li (NAOC), Ido Keinan (TAU), Iair Arcavi (TAU), David Sand (U of Arizona)

We observed the position of EP250827a (Hua et al. GCN 41553) with a Las Cumbres 1m telescope at CTIO starting on 2025-08-27 07:51:31 UT (less than 5 minutes after the alert and less than 11 minutes after the event). We obtained 2x300s exposures in the broad optical w band.

We find a source at RA=3.4679 Dec=-56.4979, not present in archival Legacy Survey (https://www.legacysurvey.org/viewer) images and measure a magnitude of 18.71 +- 0.06, calibrated to the r band (consistent with the Gemini detection; Levan et al. GCN 41554).

Addition followup is encouraged.