{
  "bibcode": "2012GCN.13851....1B",
  "body": "S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), J. R. Cummings (GSFC/UMBC),\nE. E. Fenimore (LANL), N. Gehrels (GSFC), S. T. Holland (STScI),\nH. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL),\nT. Sakamoto (AGU), G. Sato (ISAS), M. Stamatikos (OSU),\nJ. Tueller (GSFC), T. N. Ukwatta (MSU)\n(i.e. the Swift-BAT team):\n \nUsing the data set from T-239 to T+807 sec from recent telemetry downlinks,\nwe report further analysis of BAT trigger (#535747) from SGR1806-20\n(Barthelmy, et al., GCN Circ. 13844).  The BAT ground-calculated position is\nRA, Dec = 272.172, -20.448 deg, which is \n   RA(J2000)  =  18h 08m 41.2s \n   Dec(J2000) = -20d 26' 52.3\" \nwith an uncertainty of 2.4 arcmin, (radius, sys+stat, 90% containment).\nThe partial coding was 98%.\n \nThe mask-weighted light curve shows a single FRED-like pulse\nstarting at ~T-0.05 sec, peaking at ~T+0.1 sec, with a long low-level tail\nout to T+0.5 or T+1.0 sec.  T90 (15-350 keV) is 0.67 +- 0.16 sec\n(estimated error including systematics).  There is no evidence\nof additional outbursts in the post 800 sec of the lightcurve\nat the 0.13 ph/cm2/sec upper limit.\n \nThe time-averaged spectrum from T-0.05 to T+0.68 sec fit by a simple\npower-law model shows the power law index of 2.38 +- 0.42 (chi squared 69.8 for 57 d.o.f.).\nThe fluence in the 15-150 keV band is 3.3 +- 0.8 x 10^-8 erg/cm2.\nThe 1-sec peak photon flux measured from T-0.18 sec in the 15-150 keV band\nis 0.6 +- 0.1 ph/cm2/sec.\n \nA single blackbody fit to the time-averaged spectrum shows the blackbody\ntemperature of 8.1 +- 2.1 keV (chi squared 71.9 for 59 d.o.f.).\nA thermal bremsstrahlung model fit shows the temperature of 38.3 +- 21.6 keV\n(chi squared 68.1 for 57 d.o.f.).  All the quoted errors are at the 90% confidence level. \n \nThe results of the batgrbproduct analysis are available at\nhttp://gcn.gsfc.nasa.gov/notices_s/535747/BA/",
  "circularId": 13851,
  "createdOn": 1349989164000,
  "email": "scott@lheamail.gsfc.nasa.gov",
  "subject": "Swift-BAT refined analysis of the SGR 1806-20 outburst (trigger 535747)",
  "submitter": "Scott Barthelmy at NASA/GSFC  <scott@lheamail.gsfc.nasa.gov>"
}