TITLE: GCN CIRCULAR NUMBER: 42181 SUBJECT: GRB 251007B - SVOM/ECLAIRs refined analysis DATE: 25/10/10 08:31:06 GMT FROM: SVOM_group svomgroup@bao.ac.cn
Authors: O. Godet, S. Guillot (IRAP), F. Lacreu (IAP), M. Brunet, N. A. Webb (IRAP)
Using the event-by-event data downloaded through the X-band ground stations, we report further analysis of ECLAIRs observations of GRB 251007B (SVOM burst-id sb25100703).
The burst that triggered ECLAIRs onboard (Webb et al., GCN Circ. #42148) consists of a simple peak structure with a duration of T90 = 33.16 -6.76 / +3.58 s in the 4-120 keV energy band.
The time-averaged spectrum from T0-18 s to T0+22 s (T0 = 2025-10-07T19:43:23) in the energy range 5-70 keV is best fitted by a powerlaw model with a photon index of 1.58 +0.15/-0.14. With this model, the total 4-120 keV fluence is (9.0 +0.4/-0.2)e-7 erg/cm^2.
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: O. Godet (IRAP) (ogodet at irap.omp.eu)
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