GCN Circular 46151
Subject
EP241208a: SVOM/ECLAIRs refined analysis
Event
Date
2026-11-04T22:08:22Z (9 hours ago)
From
SVOM_group <svomgroup@bao.ac.cn>
Via
Web form
H. Yang, O. Godet (IRAP) report on behalf of the SVOM/ECLAIRs team:
Using the event-by-event data downloaded through the X-band ground station, we report further analysis of SVOM/ECLAIRs observations of EP241208a (GCN 38557) detected at T0 = 2024-12-08T16:35:50.016 UTC, also detected by Einstein Probe (GCN 38477).
The transient shows a bump from T0 - 3 s to T0 + 6 s lasting about 9 s in the 4 - 20 keV band. No emission was detected above 20 keV.
The time-averaged spectrum from T0 - 3 s to T0 + 6 s in the 5-20 keV energy range is well fitted by a powerlaw model, with alpha = -2.8 +/- 0.5. With this model, the 4-120 keV fluence is (1 +0.3/-0.2)e-7 erg/cm^2 and the 4-120 keV photon flux is (9 +/- 1)e-1 ph/cm^2/s.
All the quoted errors are at the 68% confidence level.
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. ECLAIRs was developed jointly by CNES, CEA-IRFU, CNRS-IRAP, CNRS-APC.
The SVOM/ECLAIRs point of contact for this burst is: Hui Yang (hui.yang at cnrs.fr)