sb26021801

General information

SVOM/ECLAIRs triggered on the long faint X-ray transient sb26021801 at 2026-02-18T05:15:18 UTC and localized it to RA=194.8408 deg, Dec=27.9434 deg with a 90% radius of 9.5 arcmin. The detection was below the slew threshold and extensive optical follow-up reports only non-detections.

Wavelength coverage

X-ray: Detected by SVOM/ECLAIRs (5–20 keV) via image trigger with SNR=8.29 over 1310.72 s.
Optical: Multiple non-detections/upper limits from SVOM/VT (VT_B, VT_R), LCO (r, z), SVOM/C-GFT (g, r, i), SVOM/COLIBRÍ (r, z), and LAST (clear). No observations were mentioned in gamma-ray (other than ECLAIRs bandpass), UV, IR (beyond optical red channels), radio, or TeV.

Lightcurve and spectrum

Redshift

What’s special vs typical

GCN 43821: sb26021801: SVOM/VT optical upper limits

2026-02-25T03:59:02.458Z | rev 0

GCN 43819: sb26021801: SVOM/C-GFT upper limit

2026-02-24T08:27:40.812Z | rev 0

GCN 43792: SVOM alert sb26021801: LCO optical upper limit

2026-02-21T14:13:23.776Z | rev 0

GCN 43784: SVOM alert sb26021801: LAST optical upper limit

2026-02-19T13:17:44.614Z | rev 0

GCN 43783: sb26021801: SVOM/COLIBRÍ (FM-GFT) optical upper limit

2026-02-19T10:40:16.007Z | rev 0

GCN 43778: sb26021801: SVOM detection of a long faint X-ray transient

2026-02-18T07:15:55.903Z | rev 0