GCN Circular 45089
Subject
GRB 260706A: SVOM detection of a burst
Event
Date
2026-07-06T16:50:02Z (5 days ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
J. Alaux, M. Brunet, S. Guillot, M. Boiziot (IRAP), F. Daigne, M. Pillas (IAP) report on behalf of the SVOM mission team:
At 2026-07-06T16:12:23 UTC (T0), SVOM/ECLAIRs triggered and located the gamma-ray burst GRB 260706A (SVOM burst-id sb26070606), which is also detected by Fermi/GBM (GCN 45088).
The following trigger information was received on the ground with low latency by the SVOM VHF Alert Network.
The burst was detected both by the Count-Rate Trigger (CRT) and the Image Trigger (IMT), which produced a sequence of 19 alerts. IMT provided the alert with the best signal-to-noise-ratio in the image (SNR) of 31.31 in the [8-120] keV energy band over a time window of 20.48 seconds starting at 2026-07-06T16:12:20.
The localization of the best alert is R.A., Dec. 33.8323, -49.1375 degrees:
R.A. (J2000) = 2h15m19.75s
Dec. (J2000) = -49d08m15.14s
with a 90% confidence level (C.L.) radius of 3.17 arcmin (including systematic error of 2 arcmin added in quadrature).
The SVOM/ECLAIRs light curve showed a multiple peak structure.
This burst also triggered SVOM/GRM at 2026-07-06T16:12:21 on a timescale of 1 second with an SNR of 9.50. The SVOM/GRM light curve showed a multiple peak structure with a T90 duration of about
22.9 -3.8/+10.5 seconds.
SVOM slewed to the burst.
No X-ray observation could be performed by SVOM/MXT for the time being.
No optical observation could be performed by SVOM/VT for the time being.
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 Frédéric Daigne: daigne@iap.fr.
Please contact the BA by email if you require additional information.