GCN Circular 39911
Subject
GRB 250328A: GWAC-F50A optical upper limit
Date
2025-03-28T17:58:43Z (3 days ago)
From
Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>
Via
Web form
L. P. Xin(NAOC), Y. G. Yang(HNU), X. H. Han, C. WU, Y. L. Qiu, J. Wang, H. L. Li, X .M. Lu, R. S. Zhang, Y. Xu, L. Huang, H. B. Cai, Y. J. Xiao, P. P. Zhang, L. Lan, W. J. Xie, Z. H. Yao, J. Y. Wei(NAOC), X. G. Wang, E. W. Liang(GXU) report on behalf of the SVOM/F50A team:
We began to observe GRB 250328A (Brunet et al., GCN 39910) with 50cm telescope (GWAC-F50A) at Xinglong station, China, at 2025-03-28T16:59:19 (UT), about 145s after the burst.
With the first observations with exposure time of 6*100 sec, no any uncatalogued source was detected in our stacked image down to a 3 sigma limit magnitude of 19.0 mag in R band, at the mid time of 7.5 min after the burst, comparing to several nearby USNO B1.0 stars.
We acknowledge the excellent support from observation assistant Yangtong Zheng and Winlong Dong.