TITLE: GCN CIRCULAR NUMBER: 39555 SUBJECT: EP250302a: SVOM/C-GFT optical observations DATE: 25/03/03 05:21:19 GMT FROM: SVOM_group svomgroup@bao.ac.cn
Chao WU (NAOC), Zhe Kang (CHO), Liping Xin(NAOC), Xuhui Han(NAOC), Pinpin Zhang (NAOC), Xiaomeng Lu (NAOC), Zhenwei Li (CHO), You Lv (CHO), Ruosong Zhang (NAOC), Yujie Xiao(NAOC), Yulei, Qiu(NAOC), Jing Wang(NAOC), Jianyan Wei (NAOC) report on behalf of the SVOM/C-GFT team:
We observed the field of EP250302a detected by Einstein Probe (Trigger ID: 01709132186) with C-GFT. Our observations were started on 2025-03-02T15:43:07 UTC, ~7.05 mins after the trigger. The optical counterpart (reported by Zhu et al. GCN 39550, Busmann et al., GCN 9551,Leonini et al., GCN 39553) was clearly detected in stacked images of band g,r and i. The results are,
(T-T0)_mid(sec) mag mag_err band ------------------------------------------ 462 18.13 +/- 0.10 i 553 18.31 +/- 0.09 g 664 18.14 +/- 0.07 r
The photometry was calibrated with nearby Pan-STARRS1 stars. Further analysis is on-going.
We thank the observation assistants Bowen Li at Jilin observatory for their excellent support.
Chinese Ground Follow-up Telescope of SVOM mission is located at Jilin, Changchun Observatory, National Astronomical Observatories, CAS. It has FOV of 1.28 deg x 1.28 deg with a 4k*4k CMOS detector mounted on the primary focus of 1.2-meter-aperure telescope.
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