{
  "bibcode": "2025GCN.41273....1R",
  "submittedHow": "web",
  "submitter": "mariaedvige.ravasio@ru.nl",
  "circularId": 41273,
  "subject": "EP250806a: Upper limit from Fermi-GBM Observations",
  "body": "M. E. Ravasio and P.G. Jonker (Radboud Univ.) on behalf of the Einstein Probe Team\nand\nE. Burns (LSU) on behalf of the Fermi-GBM Team, report:\n\nFermi-GBM had full spatial coverage of the transient EP250806a detected by EP-WXT (Yang et al., GCN 41246). There was no Fermi-GBM onboard trigger around the refined EP starting time T0=2025-08-06T09:17:30 UTC (Liang et al., GCN 41256).\n\nThe GBM targeted search [1], the most sensitive, coherent search for GRB-like signals, was run in the time interval [T0-50;T0+500] s, seeking signals between 64 ms and 32.768 s in duration. No signal consistent with the EP transient, both temporally and spatially, is identified, as confirmed also by visual inspection of the data.\n\nAssuming a “soft” spectral template  (Band function with Epeak = 70 keV, alpha = -1.9, beta = -3.7), and a duration of 8.192 s, we derive a flux upper limit of 3.7e-08 erg/cm2/s in the energy band 10-1000 keV.\n\n[1] Goldstein et al. 2019 arXiv:1903.12597",
  "createdOn": 1754597154323,
  "format": "text/plain",
  "eventId": "EP250806a"
}