{
  "bibcode": "2006GCN..4780....1B",
  "body": "L. Barbier (GSFC), S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),\nG. Cusumano (IASF-Pa INAF), E. Fenimore (LANL), N. Gehrels (GSFC),\nD. Hullinger (GSFC/UMD), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), \nD. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),\nG. Sato (ISAS), J. Tueller (GSFC)\non behalf of the Swift-BAT team:\n\nUsing a partial data set from T-60 to T+116 sec from the recent telemetry\ndownlink, we report further analysis of BAT GRB 060218 (trigger #191157)\n(Cusumano, et al., GCN 4775).  The BAT ground-calculated position is\nRA,Dec = 50.380,+16.904 deg {03h 21m 31.1s, 16d 54' 14.8\"} (J2000)\n+- 2.6 arcmin, (radius, sys+stat, 90% containment).  The partial coding was 88%.\n \nThe mask-weighted lightcurve is weak and flat from T-60 to T+120 sec\n(all the data we have so far).  Nothing can be said about T90.\nSince there is obvious emission prior to T-60 and after T+116,\nwe are not quoting the usual spectral fit values at this time.\nWe note that Swift completed a Pre-Planned Slew 8 sec prior to the beginning\nof the image trigger integration which resulted in trigger 191157,\nand therefore BAT was unable to trigger prior to this slew on this source.\nWe also note that all the emission is in the 15-50 keV band.\n\nThere is also a detection at this location at the same flux level at T+900 sec.\nAnd there is a possible 5.6-sigma detection at the same location on Jan 17, 2006\n(a month earlier).  While we can rule out that this is a chance fluctuation,\nit does call into question the GRB nature of the event (trigger 191157).\nAt this stage in the analysis, it is equally likely that this trigger\nis a GRB or hard x-ray transient.  We expect the full data set by Feb 20,\nand so will be able make a better assessment.",
  "circularId": 4780,
  "createdOn": 1140297176000,
  "email": "Scott@lheamail.gsfc.nasa.gov",
  "subject": "Preliminary refined analysis of the Swift-BAT trigger 191157",
  "submitter": "Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>"
}