TITLE:   GCN CIRCULAR
NUMBER:  38062
SUBJECT: EP241021a: continued SOAR observations
DATE:    24/11/03 15:45:48 GMT
FROM:    James Freeburn at Swinburne University of Technology <jamesfreeburn54@gmail.com>

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

We continued our observations (Freeburn et al., GCNs 37911, 37942) of the field of EP241021a (Hu et al., GCN 37834) with the Goodman High Throughput Spectrograph mounted on the SOAR telescope in imaging mode (Prop. ID: SOAR2024B-023). We took two 300s exposures each in g, r and i-band between 2024-11-03T02:16:11 and 2024-11-03T02:50:11 UTC. 

We detect the optical counterpart associated with EP241021a (Fu et al., GCN 37842; Li et al., GCNs 37844, 37846; Ror et al., GCN 37845; Zheng et al., GCN 37849; Moskvitin and Spiridonova, GCN 37850;  Pugliese et al. GCN 37852; Pérez-Fournon et al. GCN 37858, Bochenek & Perley, GCN 37869; Kumar et al., GCN 37875; Busmann et al., GCN 37877; J-Jin et al., GCN 37892; Freeburn et al., GCNs 37911, 37942; Quirola-Vasquez et al., GCN 37930; Freeburn et al., GCN 37942; Moskvitin et al. GCN 37951; Pan et al., GCN 37968; Bochenek and Perley, GCN 38030; Klingler et al., GCN 37990; Carotenuto et al., GCN 38014; Schneider et al., GCN 38022; Aryan et al., GCN 38042) in g, r and i-bands.  With photometric calibration using the Pan-STARRS1 catalogue, with an r=2.5” aperture, we measure r~22.4 AB mag, with a red color g-r~0.2 mag.