Bright GRB 260919A detected with associated X-ray transient

AI Summary

The Fermi GBM initially flagged a TGF but later identified GRB 260919A, a 250-second-long gamma-ray burst. Key parameters include a total fluence of 1.32(-0.20,+0.38)x10^-5 erg/cm^2 and peak energy flux of 2.05(-0.36,+0.64)x10^-7 erg/cm^2/s, with follow-up triangulation indicating possible association with an X-ray transient.

Measurements

Notices (1)

Fermi GBM — GRB · Sat, 19 Sep 2026 23:48:12 GMT

GCN Circulars (3)

GCN-45806 — GRB 260919A · Sat, 03 Oct 2026 16:26:27 GMT
The Konus-Wind satellite detected a long-duration gamma-ray burst (GRB 260919A) on September 19, 2026, with a significant count rate increase lasting 165 seconds. The burst's spectrum and energy flux were analyzed, revealing key parameters such as fluence and peak energy flux.

GCN-45794 — GRB 260919A · Thu, 01 Oct 2026 21:27:44 GMT
The Fermi Gamma-ray Burst Monitor (GBM) detected a bright gamma-ray burst, GRB 260919A, on September 19, 2026, with a duration of approximately 250 seconds. This event is spatially associated with the fast X-ray transient EP260920a detected by the Einstein Probe WXT, suggesting a common origin despite a temporal offset of about 600 seconds.

GCN-45792 — GRB 260919A · Thu, 01 Oct 2026 13:14:13 GMT
The long-duration Gamma-Ray Burst (GRB) 260919A was detected by Konus-Wind and Fermi-GBM at 23:48:12 UT. The event was triangulated to a 3 sigma IPN localization region of 6556 square degrees, with a maximum dimension of 147 degrees. The fast X-ray transient EP260920a, detected approximately 800 seconds after GRB 260919A, is within this localization region, suggesting a possible common origin for both events.