{
  "subject": "GRB 260914A: SVOM/VT optical observation from VHF data",
  "eventId": "GRB 260914A",
  "submittedHow": "web",
  "circularId": 45565,
  "eventType": [
    "GRB",
    "Optical Transient"
  ],
  "format": "text/plain",
  "body": "J. T. Palmerio (CEA/Irfu), C. Wu (NAOC), D. Turpin, A. Saccardi (CEA/Irfu), Y. L. Qiu,  L. P. Xin (NAOC), K. Liu (GXU), Y. Ma (NAOC), on behalf of the SVOM/VT team.\n\nAfter the trigger by SVOM/ECLAIRs (sb26091401) at 2026-09-14T11:12:31 UTC (T0), SVOM performed an automatic slew on the burst location (Wang et al., GCN 45562).\n\nFrom a preliminary analysis of the 1-bit subimage and source list downloaded via VHF network, at least one credible candidate is identified, the details of which are presented below.\n\nVT_ID 608:\n  The position of this candidate is R.A., Dec. 31.59913, 29.25485 degrees, corresponding to:\n  R.A. (J2000) = 2h06m23.8s\n  Dec. (J2000) = 29d15m17.5s\n  with an uncertainty of 0.50 arcsec.\n  This location is consistent with the optical afterglow reported by Akl et al. (GCN 45564).\n\n  This candidate was detected in both VT_R and VT_Band was flagged as a catalogued source whose brightness faded over the course of the VT observations. The candidate's magnitudes are:\n  \n  | date-obs (UTC)       | mid-time    | exposure  | VT_B mag(AB)  | VT_R mag(AB)  |\n  | -------------------- | ----------- | --------- | ------------- | ------------- |\n  | 2026-09-14T12:04:35  | 54.55 min   | 6*50 sec  |       -       | 19.80 ± 0.04  |\n  | 2026-09-14T12:51:15  | 100.8 min   | 5*50 sec  | 20.94 ± 0.10  | 20.02 ± 0.07  |\n  \n  Magnitudes were not corrected for Galactic reddening.\n\nThe Space-based multi-band astronomical Variable Objects Monitor (SVOM) is a China-France joint mission led by the Chinese National Space Administration (CNSA), French Space Agency (CNES), and the Chinese Academy of Sciences (CAS), which is dedicated to observing gamma-ray bursts and other transient phenomena in the energetic universe.\nSVOM/VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS.\n\nThe Burst Advocate (BA) on shift for this alert is Yinuo Ma: mayn@bao.ac.cn\nPlease contact the BA by email if you require additional information.",
  "createdOn": 1789395776203,
  "submitter": "SVOM_group <svomgroup@bao.ac.cn>"
}