TITLE:   GCN CIRCULAR
NUMBER:  38409
SUBJECT: EP241126a: SOAR observations of the optical counterpart
DATE:    24/12/01 21:45:36 GMT
FROM:    James Freeburn at Swinburne University of Technology <jamesfreeburn54@gmail.com>

J. Freeburn (Swinburne/OzGrav), I. Andreoni (UNC), J. Carney (UNC)

We observed the optical counterpart to the X-ray transient, EP241126a (Hu et al., GCN 38335; Zheng et al., GCN 38339), with the Goodman High Throughput Spectrograph mounted on the SOAR telescope in imaging mode. We took three 300s exposures in r-band between 2024-11-28T03:48:34 and 2024-11-28T04:07:23 UTC corresponding to ~32 hours after the initial trigger.

We detect the optical counterpart associated with EP241126a (Fu et al., GCN 38337; Li et al., GCN 38338; Geng et al., GCN 38357; Qiu et al., GCN 38378; Malesani et al., GCN 38385; Zou, GCN 38404).  With photometric calibration using the Pan-STARRS1 catalogue, we measure r= 23.325 +/- 0.090 AB magnitude.