TITLE: GCN CIRCULAR NUMBER: 38340 SUBJECT: EP trigger ID 01709122294: 1.6m Mephisto multi-band optical observations DATE: 24/11/27 10:04:16 GMT FROM: Brajesh Kumar at SWIFAR, YNU brajesh@ynu.edu.cn

Jianhui Lian, Kaushik Chatterjee, Xinlei Chen, Jinghua Zhang, Brajesh Kumar, Guowang Du, Tao Wang, Yuan Fang, Xingzhu Zou, Yu Pan, Yuanpei Yang, Xiangkun Liu, Xiaowei Liu (SWIFAR, YNU) report on behalf of the Mephisto Team:

We performed uvgr band observations of the likely EP flare event (trigger ID 01709122294; Yang et al., GCN 38289) with the 1.6m Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University located at Lijiang Observatory. The observations were initiated at 12:49:16 UTC 2024-11-21 (~18.65 hours after the trigger) and continued up to 19:46:23 UTC 2024-11-21. Multiple frames with different exposure times were acquired. Our preliminary analysis indicates the decaying nature of the flare in the u and v bands during the observations. The u and v magnitudes decayed ~0.24 and 0.11 within ~7 hours. However, no significant variations were noticed in the g and r bands.

-------------------------------------------------------------------------- Mephisto (Multi-channel Photometric Survey Telescope) is a 1.6m wide-field multi-channel telescope, the first of its type in the world, capable of imaging the same field of view in three optical bands simultaneously. It provides real-time, high-quality colors of stellar objects. The on-site telescope assemblage and commissioning were carried out in September 2022. The first light in all three channels was achieved on 2023 December 21. --------------------------------------------------------------------------

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