Optical followup of AT 2025baq with Mephisto

ATel #17022; Jinghua Zhang (SWIFAR, YNU), Jianhui Lian (SWIFAR, YNU), Brajesh Kumar (SWIFAR, YNU), Yu Pan (SWIFAR, YNU), Yuanpei Yang (SWIFAR, YNU), Chenxu Liu (SWIFAR, YNU), Zhenfei Qin (SWIFAR, YNU), Yuze Zhao (SWIFAR, YNU), Xufeng Zhu (SWIFAR, YNU), Guowang Du (SWIFAR, YNU), Xingzhu Zou (SWIFAR, YNU), Xinlei Chen (SWIFAR, YNU), Yuan Fang (SWIFAR, YNU), Xiangkun Liu (SWIFAR, YNU), Xiaowei Liu (SWIFAR, YNU)
on 9 Feb 2025; 15:37 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Brajesh Kumar (brajesh@ynu.edu.cn)

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We observed AT 2025baq (TNS Astronomical Transient Report No. 243735) with the 1.6m Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University located at Lijiang observatory. Simultaneous uvgr band observations were performed between 17:18:16 and 23:19:54 on 2025-02-08 (UT) in good sky conditions. Multiple frames with different exposure time were obtained. The possible SN was detected in all the frames. Our preliminary analysis indicates an increasing trend in u and v bands but no significant variation is noticed in g and r bands. The preliminary magnitudes of initial frames are below. Here, we caution that template subtraction has not been applied in the reported magnitudes. Further observations are planned. MJD 60714.72102 (u 18.24+-0.21), 60714.74547 (v 17.90+-0.11), 60714.72949 (g 16.45+-0.03), 60714.74550 (r 16.20+-0.02) 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.