{
  "bibcode": "2021GCN.29819....1T",
  "body": "Swift/BAT did not successfully trigger on GRB 210413B (T0: 2021-04-13\n23:46:52.45 UTC, Fermi/GBM TRIGGER 640050417).\n\nThe GUANO system is currently offline, thus no extended GUANO data is\navailable for this time, and so the sensitive GUANO MLL analysis\n(DeLaunay et al. 2021, in prep) can not be run.\n\nSwift/BAT triggered in real-time onboard in the rates domain (trigger\n#1043009), but no strong source was found to be associated in the\nonboard imaging. This 'failed trigger' resulted in 10s of BAT TTE data\nbeing saved and sent to the ground.\n\nThe duration of the burst, as seen by BAT, is T90 = 1.088 s +/- 0.09 s.\n\nIn ground analysis of the available TTE data, we find a source using\ntypical imaging analysis, that is the likely location of the GRB, with\nSNR 6 in the image domain.\nThe BAT position is\nRA, Dec = 182.558 +55.965, which is:\n    RA (J2000)     12h 10m 13.920s\n    Dec (J2000)  +55d 57' 54.00\"\nwith an estimated uncertainty of 3 arcminutes.\n\nThis location is consistent with the Fermi/GBM localization\ndistributed in the Final Position notice.\n\nXRT and UVOT follow-up has been requested. Results of follow-up\nobservations will be reported in future circulars.",
  "circularId": 29819,
  "createdOn": 1618531446000,
  "email": "aaron.tohu@gmail.com",
  "subject": "GRB 210413B: Swift/BAT detection and probable localization of a short burst",
  "submitter": "Aaron Tohuvavohu at U Toronto  <aaron.tohu@gmail.com>",
  "eventId": "GRB 210413B"
}