{
  "bibcode": "2021GCN.30125....1F",
  "body": "C. Fletcher (USRA) reports on behalf of the Fermi-GBM Team:\n\nSwift-BAT detected Swift SGR J1555.2-5402 at 09:45:46 UT (GCN 30120).\nThere was no Fermi-GBM onboard trigger around the event.\n\nAn automated, blind search for short gamma-ray bursts below the onboard\ntriggering threshold in Fermi-GBM identified no counterparts.\n\nThe GBM targeted search [1], the most sensitive, coherent search for\nGRB-like signals was run from +/-30 s around the BAT trigger time.\nA transient source was identified whose most significant timescale\naccording to the automated search is 64 ms, with a false alarm rate\nof 5.8e-05 Hz and a location consistent with the Swift-BAT event,\nusing the standard search protocol with a S/N of 6. The event was\nfound to be even more significant (S/N of 12) on the 8 ms timescale,\nbut an associated false alarm rate is currently not available on the\n8 ms timescale. The GBM targeted search event was found with the highest\nsignificance with a \"soft\" spectrum (Band function with Epeak = 70 keV,\nalpha = -1.9, beta = -3.7).\n\n[1] Goldstein et al. 2019 arXiv:1903.12597",
  "circularId": 30125,
  "createdOn": 1622828083000,
  "email": "cfletcher@usra.edu",
  "subject": "Fermi GBM Sub-Threshold Detection of new Swift SGR J1555.2-5402",
  "submitter": "Cori Fletcher at USRA  <cfletcher@usra.edu>"
}