TITLE: GCN CIRCULAR NUMBER: 42669 SUBJECT: GRB 251025B: SVOM/ECLAIRs refined analysis DATE: 25/11/13 14:50:40 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> M. Brunet (IRAP), F. Lacreu (IAP), F. Daigne (IAP), O. Godet (IRAP), S. Hussein (IJCLab) Using the event-by-event data downloaded through the X-band ground station, we report further analysis of ECLAIRs observations of GRB 251025B (SVOM burst-id sb25102502, GCN 42347) detected at T0 = 2025-10-25T14:24:05. The burst that triggered ECLAIRs consists of a multiple peak lightcurve, lasting about 80 s in the 4-120 keV energy band. The time-averaged spectrum from T0-21 s to T0+39 s in the 5-120 keV energy range is best fitted by a power-law model with a photon index of 1.60 +/-0.06. With this model, the total 4-120 keV fluence is (1.52 +0.06/-0.11)e-06 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: Marius Brunet (IRAP) (marius.brunet at irap.omp.eu) View this GCN Circular online at https://gcn.nasa.gov/circulars/42669. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...