{
  "bibcode": "2005GCN..3251....1T",
  "body": "J. Tueller, L. Barbier, S. Barthelmy (GSFC), J. Cummings (GSFC/NRC),\nE. Fenimore (LANL), N. Gehrels (GSFC), D. Hullinger (UMD),\nH. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),\nD. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/NRC),\nG. Sato (ISAS), M. Suzuki (Saitama), M. Tashiro (Saitama U.)\non behalf of the Swift/BAT team:\n\nAt 05:44:03  UT Swift-BAT detected GRB 050412 (trigger=114485)\n(GCN Circ 3237, Cummings et al.).  The refined BAT ground position\nis (RA,Dec) = 181.089,  -1.206, [deg; J2000] +- 3 arcmin, (95%\ncontainment).  This is 1.0 arc minutes from the position determined\nby the XRT (GCN Circ 3241, Tamburelli et al.) and the LCO (GCN Circ\n3244, Fox et al.)\n\nExamination of the mask weighted light curve shows a 16-second main\npeak, starting ~8 seconds before the trigger and having a roughly\nsymmetrical shape.  This is followed by smaller secondary peaks\nlasting until ~24 seconds after the trigger.  The estimated T90\n(15-350 keV) is 26 seconds +/- 2 secs (estimated error including\nsystematics).\n\nAnalysis of the event data shows that this is a very hard burst with\nsignificant emission throughout the BAT energy range (15-350 keV).\nThe time-averaged total spectrum is consistent with a simple power-law,\nwith a photon index of  -0.62 +/- 0.18 (90% confidence).  However,\nthere may be significant systematic uncertainties with such a\nhard spectrum.  The photon index of the 5-s peak spectrum (starting at\nT0-0.784 s) (also simple power-law) is -0.47 +/- 0.23 (90% confidence).\nThe fluence derived from the event data is 2.1 (+/- 0.5) X 10^-6 erg/cm^2\nin the 15-350 keV band and 9.6 (+/- 1.1) X 10^-7 erg/cm^2 in the\n15-200 keV band.  The 5-s peak flux is 0.7 +/- 0.1 ph/cm^2/s (15-350 keV).",
  "circularId": 3251,
  "createdOn": 1113323885000,
  "email": "Scott@lheamail.gsfc.nasa.gov",
  "subject": "GRB 050412: Swift-BAT refined analysis",
  "submitter": "Scott Barthelmy at NASA/GSFC  <Scott@lheamail.gsfc.nasa.gov>",
  "eventId": "GRB 050412"
}