TITLE: GCN CIRCULAR NUMBER: 43448 SUBJECT: GRB 260110A: SVOM detection of a burst through offline search DATE: 26/01/19 08:24:17 GMT FROM: SVOM_group <svomgroup@bao.ac.cn> M. Brunet, O. Godet (IRAP), N. Dagoneau (CEA) report on behalf of the SVOM team: The SVOM/ECLAIRs telescope detected a transient source, labelled GRB 260110A, starting at 2026-01-10T03:28:54.35 UTC (T0), through an offline search with the event-by-event data downloaded through the X-band ground station. The burst was detected within several energy ranges and timescales. The best detection is obtained by the onground Image Trigger (IMT) with a signal-to-noise ratio of 7.1 within 4-20 keV over a time window of 20.48 seconds starting at T0-20.48s. The event is also seen by the onboard trigger but below the alert threshold. The lightcurve shows a single peaked structure lasting around 20 s. The localization of the source is RA, Dec = 333.649, 34.236 degrees: RA (J2000) = 22h14m35.76s Dec (J2000) = 34d14m09.60s with a 90% C.L. radius of 12.4 arcmin (including systematic error of 6 arcmin added in quadrature). We note that no bright catalogued X-ray sources are found in the error box. The time-averaged spectrum from T0-18.5 s to T0+1.5 s in the energy range 5-50 keV is best fitted by a power law. The powerlaw index is -1.77 -0.29/+0.33. With this model, the total fluence in 4-120 keV is (2.95 +0.32/-1.63)e-7 erg/cm^2. All quoted errors are at the 68% confidence level. The Space 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 APC, CEA, CNES, and IRAP. The SVOM point of contact for this event is : Marius Brunet : marius.brunet at irap.omp.eu Please contact him by email if you require additional information regarding the SVOM follow-up of this burst. View this GCN Circular online at https://gcn.nasa.gov/circulars/43448. --- To unsubscribe, open this link in a web browser: https://gcn.nasa.gov/unsubscribe/eyJhbGciOiJIUzI1NiJ9.eyJlbWFpbCI6InZzbmV0LW...