{
  "bibcode": "2005GCN..3840....1F",
  "subject": "GRB050820B:  Refined analysis of the Swift-BAT burst",
  "editedOn": 1744224303529,
  "version": 2,
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Tyler Barna at University of Minnesota <tylerpbarna@gmail.com>",
  "createdOn": 1124591596000,
  "circularId": 3840,
  "eventId": "GRB 050820B",
  "submitter": "Takanori Sakamoto at NASA/GSFC  <takanori@milkyway.gsfc.nasa.gov>",
  "format": "text/plain",
  "email": "takanori@milkyway.gsfc.nasa.gov",
  "body": "E. Fenimore (LANL), L. Barbier (GSFC), S. Barthelmy (GSFC), \nJ. Cummings (GSFC/NRC), N. Gehrels (GSFC), D. Hullinger (GSFC/UMD), \nK. Hurley (Berkeley), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), \nJ. Norris (GSFC), D. Palmer (LANL), A. Parsons (GSFC), \nT. Sakamoto (GSFC/NRC), G. Sato (ISAS), J. Tueller (GSFC) \non behalf of the Swift-BAT team: \n \nUsing the full data set from the recent telemetry downlink, we report \nfurther analysis of Swift-BAT GRB 050820B (trigger #151334) \n(Page, et al., GCN 3839).  The ground-analysis position is \nRA,Dec 135.594,-72.639 (J2000) with an uncertainty of 2 arcmin \n(radius, 90%, stat+sys). \nThe light curve show a peak at T+1 sec and a cluster of merged  \npeaks at T+8 sec.  T90 is 13 +/-2 sec. \nFitting a cutoff power law over the interval from T+0.2 to T+17.3 sec, \nthe photon index is 0.5 +/- 0.2 and Epeak is 100 (-10/+15) keV \nwith a fluence of 2.8 +/- 0.2 x 10^-6 erg/cm^2 in the 15-350 keV \nband (90% c.l.). The peak flux in a 1-sec wide window starting at \nT+8.7 seconds is 4.7 +/- 0.3 ph/cm^2/sec (15-350 keV)."
}