GCN Circular 45569

Subject

Fermi GBM Sub-Threshold Detection of GRB 260914A

Event

GRB 260914A

Date

2026-09-15T01:14:15Z (3 days ago)

Edited On

2026-09-15T12:51:59Z (3 days ago)

From

rhamburg@usra.edu

Edited By

Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of rhamburg@usra.edu

Via

Web form

R. Hamburg (USRA) reports on behalf of the Fermi-GBM Team:

SVOM ECLAIRs detected GRB 260914A on 2026-09-14 at 11:12:31 UTC (GCN 45562Loading...
 
 ). There was no Fermi-GBM onboard trigger around this time.

The GBM Targeted Search [1], the most sensitive coherent search for GRB-like signals in GBM, identified a spatially-consistent transient at 2026-09-14T11:12:30.552 UTC. The Targeted Search event is found most significantly on the 4.096 s timescale with a false alarm rate of 6.1e-5 Hz. The Fermi-MET of this transient is 811077155.552 s. Additionally, the Targeted Search event was found with the highest significance using a soft GRB spectrum (Band function with Epeak = 70 keV, alpha = -1.9, beta = -3.7).

[1] Goldstein et al. 2019 arXiv:1903.12597Loading...