{
  "bibcode": "2009GCN..8835....1C",
  "body": "Valerie Connaughton (UAH) and Michael Briggs (UAH)\nreport on behalf of the Fermi GBM Team:\n\n\"At 00:53:52.17 UT on 22 Jan 2009, the Fermi Gamma-Ray Burst Monitor\ntriggered on AXP 1E1547.0-5408 (trigger 254278434 / 090122037).\n\nSince then, GBM has seen 18 triggers from this source including one\ntrigger also detected by the Swift-BAT (Palmer et al. 2009, GCN 8833).\n\nThe trigger rate is consistent with constant source activity in the\nform of short and often very bright pulses occurring within an interval\nof a few seconds to about 150s between pulses.   We estimate the source\nactivity is constant because the time between triggers is between 600s\nand 740s outside of SAA passages and periods during which the source is\nocculted by the Earth.   The minimum possible trigger spacing for\nGBM is 596 seconds.  \n\nBecause of the high data rate these triggers have caused, it is not\nyet possible to perform spectral analysis of any of these events.  We\nestimate from our real-time data, however, that the source is visible at\nleast up to 100 keV and is not visible above 300 keV.\"",
  "circularId": 8835,
  "createdOn": 1232613561000,
  "email": "valerie@nasa.gov",
  "subject": "AXP 1E1547.0-5408: Fermi GBM observations",
  "submitter": "Valerie Connaughton at MSFC  <valerie@nasa.gov>"
}