GCN Circular 45565
Subject
GRB 260914A: SVOM/VT optical observation from VHF data
Event
Date
2026-09-14T14:22:56Z (3 days ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
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.
After 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).
From 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.
VT_ID 608:
The position of this candidate is R.A., Dec. 31.59913, 29.25485 degrees, corresponding to:
R.A. (J2000) = 2h06m23.8s
Dec. (J2000) = 29d15m17.5s
with an uncertainty of 0.50 arcsec.
This location is consistent with the optical afterglow reported by Akl et al. (GCN 45564).
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:
| date-obs (UTC) | mid-time | exposure | VT_B mag(AB) | VT_R mag(AB) |
| -------------------- | ----------- | --------- | ------------- | ------------- |
| 2026-09-14T12:04:35 | 54.55 min | 6*50 sec | - | 19.80 ± 0.04 |
| 2026-09-14T12:51:15 | 100.8 min | 5*50 sec | 20.94 ± 0.10 | 20.02 ± 0.07 |
Magnitudes were not corrected for Galactic reddening.
The 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.
SVOM/VT was jointly developed by Xi'an Institute of Optics and Precision Mechanics (XIOPM), CAS and National astronomical observatories (NAOC), CAS.
The Burst Advocate (BA) on shift for this alert is Yinuo Ma: mayn@bao.ac.cn
Please contact the BA by email if you require additional information.