{
  "circularId": 46203,
  "format": "text/plain",
  "subject": "GRB 261108C: SVOM/VT early optical  upper limits",
  "submitter": "Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>",
  "eventType": [
    "GRB",
    "Optical Transient"
  ],
  "eventId": "GRB 261108C",
  "createdOn": 1794192223281,
  "body": "H. L. Li, Y. N. Ma, C. Wu, L. P. Xin, Y. L. Qiu, Z. H. Yao, J. R. Xu, L. J. Chen, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, J. S. Deng, J. Y. Wei (NAOC), J. T. Palmerio (CEA/Irfu), M. Gnaoui (IAP) report on behalf of the SVOM/VT team.\n\nSVOM/VT performed observation with automatic slew on the field of GRB 261108C triggered by SVOM/ECLAIRs (sb26110812, Hamburg et al., GCN 46198). The observation started at 2026-11-08T21:22:32 UTC, 202 seconds post trigger in VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously.\n \nNo credible uncatalogued candidates were identified in the stacked images within the MXT error box (Hamburg et al., GCN 46198), compared with the Legacy Survey, down to 21.5 mag (6.5σ) in AB magnitudes, at the mid-time of 8.0 minutes post trigger. The exposure time is 50*10 seconds for both channels. \n\nThe observation is ongoing. We are waiting for more data to perform deeper analysis.\n\nThe Space Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA, China), National Center for Space Studies (CNES, France) and the Chinese Academy of Sciences (CAS, China), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe. VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS.",
  "submittedHow": "web"
}