{
  "bibcode": "2006GCN..5581....1K",
  "body": "H. Krimm (GSFC/USRA), S. Barthelmy (GSFC), S. Campana (INAF-OAB),\nJ. Cummings (GSFC/UMBC), G. Israel (INAF-OAR), D. Palmer (LANL),\nA. Parsons (GSFC) on behalf of the Swift-BAT team:\n\nThe Burst Alert Telescope (BAT) on Swift has detected a faint outburst from\nthe anomalous X-ray pulsar (magnetar) CXOU J164710.2-455216 in the cluster\nWesterlund 1.  This pulse was 20 msec long starting at 01:34:52 UTC\nSep. 21, 2006 and shows a FRED profile.    The best fit postion is\nRA, Dec 251.749, -45.918 (J2000), +/- 3 arcmin  (radius, sys+stat,\n90% containment).  The Chandra position of the AXP is just outside the\nerror circle, at 3.3 arc minutes from the best position.\n\nThe transient event is detectable in the 12-60 keV band at 0.084 cts/cm2.\nFitting to a simple power law gives a fluence in the 15-150 keV band of\n1.1 +/- 0.6 X 10^-7 erg/cm2 and a power law index 3.5 +/- 0.5.  All the\nquoted errors are at the 90% confidence level.\n\nThis location was observed with the XRT as a target of opportunity starting\nat approximately 14:29 UTC Sep. 21, 2006.  The spacecraft is currently in\nthe data gap so the XRT data will not be avaiable for at least another\ntwo hours.\n\nNote that this trigger generated a GCN SWIFT_BAT_POSITION and a\nSWIFT_BAT_TRANSIENT_POSITION both of which were retracted based on\nexamination of the TDRSS light curve.  It was identified in the flight\ncode as coincident with GX 340+01, which is 22 arc minutes away.\nMore careful analysis of the ground data and a close positional coincidence\nwith CXOU J164710.2-455216 indicates that BAT detected a faint but real\noutburst, and it was probably from this transient source.\n\nWe encouraged follow-up observations of the source.",
  "circularId": 5581,
  "createdOn": 1158873731000,
  "email": "krimm@milkyway.gsfc.nasa.gov",
  "subject": "Swift detects a hard X-ray burst from AXP CXOU J164710.2-455216",
  "submitter": "Hans Krimm at NASA-GSFC  <krimm@milkyway.gsfc.nasa.gov>"
}