GCN Circular 40366
Subject
GRB 250506A: Xinglong 2.16m optical upper limit
Date
2025-05-06T16:04:35Z (12 days ago)
From
Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>
Via
Web form
L. P. Xin, J. Zhen, J. Wang, H. L. Li, Y. L. Qiu, C. Wu, X. H. Han, Y. Xu, P. P. Zhang, Y. J. Xiao, L. Lan, W. J. Xie, J. S. Deng, J. Y. Wei (NAOC) report on behalf of SVOM follow-up team:
We observed the field of GRB 250506A (Wang et al., GCN 40358; Maggi et al., GCN 40364; Fermi team GCN 4035). using the 2.16-m telescope located at Xinglong observatory, China, equipped with the BFOSC camera. The weather is not good. We obtained 2*200s and 7x300s frames in R-band, starting at 14:00:19 UT on 2025-05-06,about 11.65 hrs after the trigger.
No any uncatalogued sources were detected within the error box of EP/FXT(Zhang et al., GCN 40365) or SVOM/Eclairs or SVOM/MXT (Maggi et al., GCN 40364) in our stacked image, down to a 3 sigma limiting magnitude of R~21.0 mag, calibrated with the nearby PanSTARRS field.