{
  "bibcode": "2026GCN.43759....1R",
  "submitter": "mariaedvige.ravasio@ru.nl",
  "subject": "EP260214a / GRB 260214A: Fermi-GBM Sub-Threshold Detection",
  "createdOn": 1771186837069,
  "body": "M. E. Ravasio (Radboud Univ.), P.G. Jonker (Radboud Univ.)\nand\nE. Burns (LSU), R. Hamburg (USRA)\nreport on behalf of the Fermi-GBM Team:\n\nFermi-GBM had full spatial and temporal coverage of the transient EP260214a detected by EP-WXT (Li et al., GCN 43742, Li et al., GCN 43751). There was no Fermi-GBM onboard trigger around the EP refined starting time T0=2026-02-14T20:37:00 (UTC).\n\nThe GBM Targeted Search [1], the most sensitive, coherent search for GRB-like signals, was run in the time interval [-50;+500] s from the EP T0. A weak transient signal was found most significantly at ~T0+35 s on a 16 s timescale, with a false alarm rate of 2.27e-04 Hz. The localisation is consistent with the EP one, with a spatial association probability of 87.4%. Among the three spectral templates tested, the transient was best-fit with a \"soft\" spectrum (i.e., a Band function with Epeak = 70 keV, alpha = -1.9, beta = -3.7) for a GRB.\n\n[1] Goldstein et al. 2019 arXiv:1903.12597",
  "circularId": 43759,
  "submittedHow": "web",
  "eventId": "EP260214a",
  "format": "text/plain"
}