{
  "createdOn": 1749581595964,
  "circularId": 40672,
  "eventId": "GRB 250610B",
  "submitter": "Weikang Zheng at UC Berkeley <weikang@berkeley.edu>",
  "subject": "GRB 250610B : SVOM/GWAC-F60A and F50 observations",
  "submittedHow": "email",
  "bibcode": "2025GCN.40672....1W",
  "body": "J. Wang, W. L. Dong, L. P. Xin(NAOC), L. J. Chen(GXU), Y. G. Yang(HNU), X.\nH. Han, C. WU, Y. L. Qiu, H. L. Li, X .M. Lu, R. S. Zhang, Y. Xu, L. Huang,\nH. B. Cai, Y. J. Xiao, P. P. Zhang, L. Lan,  W. J. Xie, Z. H. Yao, J. Y.\nWei(NAOC), X. G. Wang, E. W. Liang(GXU) and W. Zheng (UCB) report on behalf\nof the SVOM follow-up team:\n\nWe observed the field of SVOM GRB 250610B (Saccardi et al., GCN 40671) with\nthe GWAC-F60A and GWAC-F50 at Xinglong Observatory, China. F60A started\nobserving at 2025-06-10T17:14:17.39 UTC with a set of 34 images in R-band.\nF50 started observing at 2025-06-10T17:14:17.39 UTC and with a set of 9\nimages in R-band.\n\nAfter coadding the images, we do not find any uncatalog candidate within\nthe SVOM/ECLAIRs error box. We estimate the upper limit of 16.0 mag for\nGWAC-F60A at mid time of 54.5 minutes after brust, and upper limit of 17.5\nmag for GWAC-F50 at mid time of 54.0 minutes after brust.\n\nTwo 60cm GWAC-F60(A/B) are operated by Guangxi University and NAOC, CAS, at\nXinglong Observatory, China. The field of view is 19*19 arcmin.  The 50cm\ntelescope (F50A) is operated by Huaibei Normal University and NAOC, CAS, at\nXinglong Observatory, China. The field of view is 27*27 arcmin.\n"
}