{
  "bibcode": "2010GCN.11300....1B",
  "body": "S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),\nN. Gehrels (GSFC), H. A. Krimm (GSFC/USRA), V. Mangano (INAF-IASFPA),\nC. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC),\nM. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (GWU)\n(i.e. the Swift-BAT team):\n \nUsing only a partial data set from T+247 to T+303, T+706 to T+723 and\nT+728 to T+963 sec (T=08:05:06 UT) from recent downlinks, we report further analysis\nof MAXI J1659-152 (Swift-BAT trigger #434928) (Negoro, ATEL 2873 and\ninitially reported as GRB 100925A in Mangano, et al., GCN Circ. 11296).\nThe BAT ground-calculated position is RA, Dec = 254.750, -15.206 deg, which is \n   RA(J2000)  =  16h 59m 00.0s \n   Dec(J2000) = -15d 12' 20.1\" \nwith an uncertainty of 2.9 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 38%.\n \nNo statement can be given about the BAT lightcurve because of the fragmented\ncoverage of the transient.  This fragmentation is caused by (a) a second\nSwift-BAT trigger on the same source (a 64-sec image trigger, #434931,\nat 09:47:13 UT) and (b) the very long integration time of the first trigger (26.5 min).\nThe normal set of event-by-event data used to do this \"refined\" analysis\nis not fully available (the on-board event ring buffer has been nearly\ncompletely wrapped).\n \nThe time-averaged spectrum in the 3 time intervals listed above\nis best fit by a simple power-law model.  The power law index\nof the time-averaged spectrum is 1.79 +- 0.43.  We caution even this\nlimited analysis because of the partial coverage of the time interval\nof the event. \n\nFurther, the time-averaged spectrum from T+0.0 to T+64.0 sec (T=09:47:13 UT,\nthe second trigger) is best fit by a simple power-law model.  The power law\nindex of the time-averaged spectrum is 2.36 +- 0.61.  All the quoted errors\nare at the 90% confidence level.\n\nThe GCN Notices for the first trigger were distributed with a GRB label,\nbecause the location did not match any known source in the on-board and\nground catalogs.  However, the GCN Notices for the second trigger were\nlabeled as a transient because the location matched the location of the\nfirst trigger (AT trigger locations are maintained in the on-board catalog\nup to the 4th trigger in a 3-deep ring buffer).",
  "circularId": 11300,
  "createdOn": 1285440941000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "MAXI J1659-152: Swift-BAT refined analysis (triggers 434928 and 434931)",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>"
}