TITLE: GCN CIRCULAR NUMBER: 44550 SUBJECT: GRB 260510B: SVOM/ECLAIRs refined analysis DATE: 26/05/11 14:12:00 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> N. Dagoneau (CEA), A. Saccardi (CEA), B. Cordier (CEA), 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 ECLAIRs observations of GRB 260510B (SVOM burst-id sb26051001). The burst that triggered ECLAIRs onboard (GCN 44515) consists of a multiple peaks lightcurve with a duration of T90 = 12.05 -3.49 / +2.22 s in the 4-120 keV energy band. The time-averaged spectrum (from T0-0.13s to T0+12.16s) in the energy range 5-120 keV is best fitted by a simple power-law model with a photon index -1.43 +/- 0.12. With this model,the 4-120 keV fluence is (4.604 ± 0.481)E-7 erg/cm² and the 4-120 keV photon flux is 0.93 ± 0.09 ph/cm²/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. The SVOM/ECLAIRs point of contact for this burst is: Nicolas Dagoneau (CEA) (nicolas.dagoneau at cea.fr) View this GCN Circular online at https://gcn.nasa.gov/circulars/44550. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...