{
  "editedOn": 1780405589684,
  "version": 2,
  "subject": "EP260526a: SVOM/VT optical upper limits",
  "createdOn": 1780023128846,
  "body": "J. R. Xu, H. L. Li, C. Wu, Y. L. Qiu, L. P. Xin, Y. N. Ma, Z. H. Yao, X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. S. Deng, J. Y. Wei (NAOC) and J. Palmerio (CEA/Irfu) report on behalf of the SVOM/VT team.\n\nSVOM/VT performed ToO observations to the field of EP260526a triggered by Einstein Probe (Yang et al., GCN 44712). The observation started at 2026-05-27T05:44:54 UTC, 20.022 hours post trigger in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously.\n\nNo uncatalogued sources were detected in stacked images within the error box of EP-FXT (Yang et al, GCN 44721) and EP-WXT (Yang et al, GCN 44712), compared to the Legacy Survey. The 3 sigma limit magnitudes are derived as follows:\n\nMid time | Band | Exposure Time | 3 sigma upper limit\n21.53 h    VT_B       57*50 s        > 23.5 mag\n21.53 h    VT_R       57*50 s        > 23.3 mag\n\nOur non-detection is consistent with the observations from COLIBRÍ (Becerra et al., GCN 44710) and  LCO (van Hoof et al., GCN 44713).\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.",
  "format": "text/plain",
  "submittedHow": "web",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Daniele Bjørn Malesani at Cosmic Dawn Center, Niels Bohr Institute <daniele.malesani@nbi.ku.dk>",
  "eventId": "EP260626a",
  "submitter": "Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>",
  "bibcode": "2026GCN.44732....1X",
  "circularId": 44732
}