{
  "submitter": "Liping Xin at NAOC, SVOM <xlp@nao.cas.cn>",
  "createdOn": 1772587225185,
  "eventId": "GRB 260303A",
  "submittedHow": "web",
  "body": "L. P. Xin, Y. N. Ma, H. L. Li, C. Wu, Z. H. Yao, Y. L. Qiu,  X. H. Han, J. Wang, Y. Xu, P. P. Zhang, W. J. Xie, Y. J. Xiao, H. B. Cai, L. Lan, J. R. Xu, J. S. Deng, J. Y. Wei (NAOC), J. Palmerio (CEA/Irfu), Ziqi Wang and Defeng Kong(GXU) report on behalf of the SVOM/VT team.\n\nSVOM/VT performed observation with auto slew to the field of GRB 260303A triggered by SVOM/ECLAIRs (sb26030303,Wang et al., GCN 43901). The observation started at 2026-03-03T06:12:27 UTC, i.e. about 9.5 minutes post trigger in the VT_B (400nm-650nm) and VT_R (650nm-1000nm) channels simultaneously. \n\nThe optical afterglow reported (Schneider et al., GCN 43902) was clearly detected in both channels.  \nThe magnitudes we derived are:\nmid time (min) | exposure time (s)| band| mag (AB) \n-------------|-------------------|------ |--------------\n    10.4     |      50           |  VT_B |  19.29+/-0.05\n    10.4     |      50           |  VT_R |  17.62+/-0.02\n    47.5     |      50           |  VT_B |  20.48+/-0.11\n    47.5     |      50           |  VT_R |  19.51+/-0.07\n\nMore detailed analysis is still on going. \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.\n\n",
  "circularId": 43916,
  "format": "text/plain",
  "subject": "GRB 260303A: SVOM/VT optical observations ",
  "bibcode": "2026GCN.43916....1X"
}