GCN Circular 38176
Subject
GRB 241112B: Mephisto optical upper limits
Date
2024-11-12T14:52:04Z (19 days ago)
From
Brajesh Kumar at SWIFAR, YNU <brajesh@ynu.edu.cn>
Via
Web form
Guowang Du (SWIFAR, YNU), Weikang Lin (SWIFAR, YNU), Brajesh Kumar (SWIFAR, YNU), Yaosong Yu (SWIFAR, YNU), Yehao Cheng (SWIFAR, YNU), Xinlei Chen (SWIFAR, YNU), Yu Pan (SWIFAR, YNU), Xingzhu Zou (SWIFAR, YNU), Jinghua Zhang (SWIFAR, YNU), Yuanpei Yang (SWIFAR, YNU), Yuan Fang (SWIFAR, YNU), Xuhui Han (NAOC), Pinpin Zhang (NAOC), Liping Xin (NAOC), Chao Wu (NAOC), Xiangkun Liu (SWIFAR, YNU), Xiaowei Liu (SWIFAR, YNU) report on behalf of the Mephisto Team:
The 1.6m Multi-channel Photometric Survey Telescope (Mephisto) of Yunnan University located at Lijiang Observatory was triggered to observe GRB 241112B (sb24111201) detected by SVOM/ECLAIRs and SVOM/GRM (Yang et al., GCN 38173). The observations were started at 11:46:00 (UT) 2024-11-12 (~0.8 hr after SVOM trigger) and multiple frames were obtained in uvgriz bands. No new candidate was detected in the stacked images, consistent with Kumar et al. (GCN 38175). The 3-sigma upper limits are the following:
Mid-Time(UT) Band Exp(s) Lim-mag(AB)
2024-11-12T11:50:43 u 180*3 >21.21
2024-11-12T12:01:14 v 180*3 >21.50
2024-11-12T11:50:40 g 50*9 >21.84
2024-11-12T12:01:12 r 50*9 >22.10
2024-11-12T11:49:55 i 79*5 >21.16
2024-11-12T12:01:16 z 79*6 >20.47
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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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