{
  "circularId": 45574,
  "format": "text/plain",
  "subject": "Fermi GBM Sub-Threshold Detection of GRB 260915A",
  "eventId": "GRB 260915A",
  "eventType": [
    "GRB",
    "Gamma-ray Transient"
  ],
  "createdOn": 1789448210655,
  "body": "R. Hamburg (USRA) reports on behalf of the Fermi-GBM Team:\n\nSVOM ECLAIRs detected GRB 260915A on 2026-09-15 at 01:12:03 UTC (GCN 45570). There was no Fermi-GBM onboard trigger around this time.\n\nThe GBM Targeted Search [1], the most sensitive coherent search for GRB-like signals in GBM, identified a spatially-consistent transient at 2026-09-15T01:12:01.517 UTC. The Targeted Search event is found most significantly on the 32.768 s timescale with a false alarm rate of 8.3e-5 Hz. The Fermi-MET of this transient is 811127526.517 s. Additionally, the Targeted Search event was found with the highest significance using a normal GRB spectrum (Band function with Epeak = 230 keV, alpha = -1.0, beta = -2.3).\n\n[1] Goldstein et al. 2019 arXiv:1903.12597",
  "submittedHow": "web",
  "submitter": "rhamburg@usra.edu"
}