Skip to main content
Updates to LVK & CHIME Notices, Schema v7.2.3! See news and announcements

GCN Circular 45460

Subject
Fermi GBM trigger 809666623/260829141 is not a GRB
Date
2026-08-29T04:11:56Z (2 days ago)
From
rhamburg@usra.edu
Via
Web form
R. Hamburg (USRA) reports report on behalf of the Fermi Gamma-ray Burst Monitor Team:

"The Fermi Gamma-ray Burst Monitor (GBM) trigger 809666623/260829141 at 03:23:38.10 UT on 29 August 2026, tentatively classified as a GRB, is in fact not due to a GRB. This trigger is likely due to local particles."
Questions or comments?
Contact GCN directly.
Have you found a bug in GCN?
Open an issue.
Want to contribute code to GCN?
Get involved on GitHub.

gcn.nasa.gov

A service of the Astrophysics Science Division at NASA Goddard Space Flight Center

Looking for U.S. government information and services? Visit USA.gov