GCN Circular 37968
Subject
EP241021a: Optical rebrightening observations with Mephisto
Date
2024-10-30T13:21:56Z (2 days ago)
From
Brajesh Kumar at SWIFAR, YNU <brajesh@ynu.edu.cn>
Via
Web form
Yu Pan, Brajesh Kumar, Weikang Lin, Guowang Du, Yangwei Zhang, Tao Wang, Runnan Jiang, Yaosong Yu, Xingzhu Zou, Xinlei Chen, Jinghua Zhang, Yuanpei Yang, Yuan Fang, Yehao Cheng, Chenxu Liu, Xiangkun Liu, Xiaowei Liu (SWIFAR, YNU) report on behalf of the Mephisto Team:
We observed the field of EP241021a (Hu et al., GCN 37834) on 2024-10-29 with the 1.6m Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University located at Lijiang Observatory. Two frames of 300s were acquired in uvgriz bands between 15:10:34 to 15:36:22 UT. The OT (Fu et al., GCNs 37840, 37842; Li et al., GCNs 37844, 37846; Ror et al., GCN 37845; Zheng et al., GCN 37849; Moskvitin & 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;) for which rebrightening was noticed by Quirola-Vasquez et al., (GCN 37930), Freeburn et al., (GCN 37942), and Moskvitin et al. (GCN 37951) is clearly detected in our stacked r band image with 21.9 +/- 0.2 mag (2024-10-29T15:15:40, Mid-Exp-Time). The limiting magnitudes in other bands are provided below. Further Mephisto observations are planned.
Mid-Time(UT) Band Exp(s) Lim-mag(AB)
2024-10-29T15:31:10 u 300x2 >22.64
2024-10-29T15:15:41 v 300x2 >22.65
2024-10-29T15:31:09 g 300x2 >23.14
2024-10-29T15:31:12 i 300x2 >22.12
2024-10-29T15:15:44 z 300x2 >21.11
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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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