GRB 261114A
GCN Circular 46278
Subject
GRB 261114A: NOT optical observations
Date
2026-11-14T22:11:24Z (7 hours ago)
From
luca.izzo@inaf.it
Via
Web form
B. Schneider (LAM), L. Izzo (INAF/OACN & DARK/NBI), D. B. Malesani (DAWN/NBI and Radboud U.), A. Saccardi (CEA/Irfu), A. Martin-Carrillo (UCD), A. Caballero Almagro (NOT), A. S. Mårtensson (NOT) report on behalf of a larger collaboration:
We observed the optical counterpart (Wu et al., GCN 46269; Zhao et al., GCN 46272; Li et al., GCN 46273; Li et al., GCN 46277) of the SVOM/ECLAIRs GRB 261114A (Li et. al., GCN 46267) using the Nordic Optical Telescope (NOT) equipped with the ALFOSC instrument. Observations were performed starting at 20:54:24 UT on 14 November 2026 (about 11.5 hr after the SVOM trigger), and consisted of 3x300 s in the SDSS-r band.
In our stacked image, we measure the preliminary AB magnitude:
r = 22.38 ± 0.13
This magnitude is calibrated using nearby objects from the SkyMapper catalog and is not corrected for Galactic extinction.
GCN Circular 46277
Subject
GRB 261114A: SVOM/VT optical observations of a plateau after 5 ks
Date
2026-11-14T18:30:49Z (11 hours ago)
From
Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>
Via
Web form
H. L. Li, C. Wu, Y. L. Qiu, Y. N. Ma, L. P. Xin, L. J. Chen, Z. H. Yao, J. R. Xu, 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), Ziqi Wang (GXU) report on behalf of the SVOM/VT team.
SVOM/VT performed continuous observations on the SVOM burst GRB 261114A (sb26111401, Li et al., GCN 46267) in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously (Li et al., GCN 46273).
The optical counterpart (Wu et al., GCN 46269; Zhao et al., GCN 46272) remains bright, with VT_R~20.4+/-0.1 mag at 3.24 hr post trigger. A plateau is seen in the light curves of both channels after 5 ks. Our measurements are in AB magnitudes and are not corrected for Galactic extinction.
Further observations are planned.
The 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.
GCN Circular 46273
Subject
GRB 261114A: SVOM/VT optical afterglow confirmation
Date
2026-11-14T14:02:23Z (15 hours ago)
From
Huali Li at at NAOC, SVOM <lhl@nao.cas.cn>
Via
Web form
H. L. Li, C. Wu, Y. L. Qiu, Y. N. Ma, L. P. Xin, L. J. Chen, Z. H. Yao, J. R. Xu, 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), Ziqi Wang (GXU) report on behalf of the SVOM/VT team.
SVOM/VT performed observations with automatic slew on the field of GRB 261114A detected by SVOM/ECLAIRs (sb26111401, Li et al., GCN 46267). Our observation started on 2026-11-14T09:39:05 UT, 352 seconds post trigger in the VT_B (400-650 nm) and VT_R (650-1000 nm) channels simultaneously .
With the X-band data available, the optical counterpart identified through VT-VHF data (Wu et al., GCN 46269; Zhao et al., GCN 46272) was clearly detected in single frame of both channels. It shows a decay with a slope index of -0.9 over our 1.5 hr observation span. The following measurements are in AB magnitudes and are not corrected for Galactic extinction:
Mid time | Band | Exposure Time | Brightness
387 s VT_B 70 s 19.5 +/- 0.1 mag
387 s VT_R 70 s 18.0 +/- 0.1 mag
More observations are ongoing.
The 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.
GCN Circular 46272
Subject
GRB 261114A: Marginal detection with 60cm Panzhihua Telescope
Date
2026-11-14T13:41:50Z (16 hours ago)
From
Jiewei Zhao at SWIFAR, YNU <meow.jiewei.zhao@gmail.com>
Via
Web form
Jiewei Zhao, Xinchao Wang, Brajesh Kumar, Wenyu Li, Guowang Du, Yuanpei Yang (SWIFAR, YNU), Bin-Bin Zhang, Kamil Nadaf (NJU), Kai Liao, Xinyu Wang, Xing Yao, Yang Zeng and Chunlai Zhang (SSO) report on behalf of a larger collaboration:
We observed the GRB 261114A field detected by SVOM/ECLAIRs (Li et al., GCN 46267). The observations were performed under the moderate sky conditions starting from 2026-11-14T11:29:33.330 (~1.94 hours after the trigger) with the 60cm Panzhihua Telescope located at the Sichuan South Observatory (SSO), China. Several frames with 300s exposure each were acquired in L band. There is a marginal detection of the optical counterpart (Wu et al., GCN 46269) in the stacked image with following magnitude:
MJD (Exp_Start) MAG FILTER EXPTIME
61358.478858 20.88 +/- 0.29 L 12 x 300s
Here we note that during the observations, the target was at a low altitude and moderate weather conditions, thus the result should be considered carefully. Also, the expected Galactic extinction is not applied in these estimates.
GCN Circular 46269
Subject
GRB 261114A: SVOM/VT optical detection from VHF data
Date
2026-11-14T11:22:26Z (18 hours ago)
Edited On
2026-11-14T20:05:58Z (9 hours ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Edited By
K.L. Page at U Leicester <klp5@leicester.ac.uk> on behalf of SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
C. Wu, H.L. Li, L. P. Xin, Y. L. Qiu (NAOC), J. T. Palmerio, Ziqi Wang (GXU), Wenjin Xie (NAOC) on behalf of the SVOM/VT team.
After the trigger by SVOM/ECLAIRs (sb26111401) at 2026-11-14T09:33:13 UTC (T0), SVOM performed an automatic slew on the burst location (Li et al., GCN 46267). From a preliminary analysis of the 1-bit subimage and source list downloaded via VHF network, one credible candidate is identified, the details of which are presented below. The position of this candidate is R.A., Dec. 345.81339, -32.31699 degrees, corresponding to:
R.A. (J2000) = 23h03m15.21s
Dec. (J2000) = -32d19m01.2s
with an uncertainty of 0.50 arcsec. This candidate was detected in both VT_R and VT_B band of the VT observations. The candidate's magnitudes are:
| date-obs (UTC) | mid-time - T0 | exposure | VT_B mag(AB) | VT_R mag(AB) |
|---|---|---|---|---|
| 2026-11-14T09:37:55 | 6.45 min | 6*70 sec | 19.54 +/- 0.02 | 18.09 +/- 0.01 |
| 2026-11-14T09:46:05.000 | 14.55 min | 6*70 sec | 20.10 +/- 0.04 | 18.54 +/- 0.03 |
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.
GCN Circular 46267
Subject
GRB 261114A: SVOM detection of a burst
Date
2026-11-14T10:14:00Z (19 hours ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
An Li (BNU), Hatsune Goto (CEA/RIKEN), Nicolas Dagoneau (CEA), Diego Götz (CEA), Andrea Saccardi (CEA), Bertrand Cordier (CEA), Ziqi Wang (GXU), Wenjin Xie (NAOC) report on behalf of the SVOM mission team:
At 2026-11-14T09:33:13 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 261114A (SVOM burst-id sb26111401). The following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.
The burst was detected by the Image Trigger (IMT), from which we received a sequence of 4 alerts. At the time of reception, IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 13.84 in the [8-120] keV energy band over a time window of 40.96 seconds starting at 2026-11-14T09:32:53. Note that at least 25 alerts were generated but only 4 have been received.
The localization of the best alert is R.A., Dec. 345.8973, -32.3702 degrees:
R.A. (J2000) = 23h03m35.35s
Dec. (J2000) = -32d22m12.60s
with a 90% confidence level (C.L.) radius of 5.91 arcmin (including systematic error of 2 arcmin added in quadrature).
The SVOM/ECLAIRs light curve showed a single broad peak structure with a T90 duration of about 46 -9 / +6 s.
SVOM slewed to the burst. SVOM/MXT began observing the field after the slew. Using onboard processed data, no X-ray source was detected with MXT.
VT began observing the field after the slew. The analysis of the data will be published in a future circular.
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/ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC. SVOM/GRM was developed by the Institute of High Energy Physics (IHEP) of CAS. SVOM/MXT was developed jointly by CNES, CEA-IRFU, CNRS-IJCLab, University of Leicester, MPE.
The Burst Advocate (BA) on shift for this alert is Wenjin XIE: xiewj@bao.ac.cn.
Please contact the BA by email if you require additional information.