SVOM detects GRB 260802A, possibly a Magnetar event.

AI Summary

GRB 260802A was detected as a short, soft gamma-ray burst by SVOM/ECLAIRs with a localization radius of 9.72 arcmin. Follow-up observations by EP-FXT identified a catalogued source within the error circle, measuring an average unabsorbed flux of 3.65 x 10^-11 erg/s/cm^2.

Measurements

Notices (1)

SVOM — GRB · Sun, 02 Aug 2026 09:25:42 GMT

GCN Circulars (6)

GCN-45277 — GRB 260802A · Mon, 03 Aug 2026 04:01:00 GMT
The Einstein Probe's EP-FXT instrument conducted a follow-up observation of GRB 260802A, detected by SVOM/ECLAIRs, approximately 3.65 hours after the initial trigger. The observation identified a catalogued source within the error circle, consistent with previous detections, and measured an average unabsorbed flux of 3.65 x 10^(-11) erg/s/cm^2 in the 0.5-10 keV energy range.

GCN-45276 — GRB 260802A · Sun, 02 Aug 2026 16:50:27 GMT
The SVOM/VT telescope observed the gamma-ray burst GRB 260802A, triggered by SVOM/ECLAIRs, but detected no uncatalogued optical transient at the position of the possible associated source EP J223759.5+531421. The observations were conducted in both VT_B and VT_R bands with upper limits of 23.0 magnitudes.

GCN-45275 — GRB 260802A · Sun, 02 Aug 2026 13:53:21 GMT
The SVOM satellite detected a gamma-ray burst (GRB 260802A) on August 2, 2026, but no optical counterpart was found within the MXT localization region. The 5-sigma upper limits for the optical upper limits are >21.5 magnitude in both VT_B and VT_R bands.

GCN-45274 — GRB 260802A · Sun, 02 Aug 2026 13:15:26 GMT
The SVOM mission team observed the field of GRB 260802A using the LCO 1m telescope at McDonald Observatory, but did not detect any new source within the SVOM/ECLAIRs error box, setting an upper limit of r > 20.96 AB magnitude 1.07 hours after the trigger.

GCN-45272 — GRB 260802A · Sun, 02 Aug 2026 11:23:07 GMT
The SVOM/COLIBRÍ telescope observed the field of GRB 260802A and did not detect any new optical source at the position of the ECLAIRs source down to a 5-sigma limit of z > 22.6. The coordinates of the ECLAIRs source coincide with the magnetar EP J223759.5+531421, and further observations are ongoing.

GCN-45270 — GRB 260802A · Sun, 02 Aug 2026 10:09:19 GMT
The SVOM mission detected a short, soft gamma-ray burst, GRB 260802A, which could potentially be a Magnetar (SGR) event due to its characteristics and location. The burst was localized with a 90% confidence level radius of 9.72 arcmin and had a duration of approximately 0.2 seconds.