GCN Circular 43448

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 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 image trigger (IMT) within 5-20 keV over 20.48 s, 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.