GCN Circular 38972
Subject
EP250108a / AT2025kg: GMG Optical Observations
Date
2025-01-18T04:40:23Z (4 days ago)
From
Fei-Fan Song at Yunnan Observatories <songfeifan@ynao.ac.cn>
Via
Web form
F.-F. Song, R.-Z. Li, B.-T. Wang, J. Mao, K.-X. Lu and J.-M. Bai (YNAO) report:
We observed the field of EP 250108a (Li et al., GCN 38861, T0 at 2025-01-08T12:30:28.34 UTC) using the GMG-2.4m telescope at the Lijiang Observatory. The observations were made three times, starting at 2025-01-15T14:26:43, 2025-01-16T12:33:50 and 2025-01-16T12:38:36, respectively. The optical counterpart of EP 250108a (Eyles-Ferris, GCN 38878; Zhu et al., GCN 38885; Malesani et al., GCN 38902; Kumar et al., GCN 38907; Zhu et al, GCN 38908; L. Izzo, GCN 38912; Zou et al., GCN 38914; Moskvitin et al., GCN 38925) was detected.
The preliminary analysis results are shown as follows:
+---------------+----------+--------------+--------------+
| Tmid-T0 [h] | Filter | Mag | 5-sigma UL |
+===============+==========+==============+==============+
| 170.10 | r | 20.75 ± 0.16 | 21.1 |
+---------------+----------+--------------+--------------+
| 192.09 | g | 20.78 ± 0.09 | 21.7 |
+---------------+----------+----------+------------------+
| 192.17 | r | 20.28 ± 0.07 | 21.6 |
+---------------+----------+--------------+--------------+
The given magnitudes are derived based on calibrating against Pan-STARRS1 field stars. We acknowledge the staff at the Lijiang Observatory for conducting the observation.