{
  "eventId": "XRF 040912",
  "email": "lamb@oddjob.uchicago.edu",
  "submitter": "Don Lamb at U.Chicago  <lamb@oddjob.uchicago.edu>",
  "body": "XRF 040912 (=H3557):  Spectral and Temporal Properties\n\nJ-F Olive, G. Ricker, J-L. Atteia, N. Kawai, D. Lamb, and S. Woosley,\non behalf of the HETE Science Team;\n\nT. Donaghy, E. Fenimore, M. Galassi, C. Graziani, M. Matsuoka,\nY. Nakagawa, T. Sakamoto, R. Sato, Y. Shirasaki, M. Suzuki,\nT. Tamagawa, Y. Urata, T. Yamazaki, Y. Yamamoto, and A. Yoshida, on\nbehalf of the HETE WXM Team;\n\nN. Butler, G. Crew, J. Doty, A. Dullighan, G. Prigozhin, R. Vanderspek,\nJ. Villasenor, J. G. Jernigan, A. Levine, G. Azzibrouck, J. Braga,\nR. Manchanda, and G. Pizzichini, on behalf of the HETE Operations and\nHETE Optical-SXC Teams;\n\nC. Barraud, M. Boer, J-P Dezalay, and K. Hurley, on behalf of the HETE\nFREGATE Team;\n\nreport:\n\nThe burst-average photon number spectrum of GRB 040912 is best fit by\na power-law times exponential (PLE) model with a photon index alpha =\n1.75 +0.28/-0.30 and a peak energy E_peak = 14.5 +/-14.5 keV.\n\nThe fluence of the burst is (8.3 +1.4/-1.3 ) x 10-7 erg cm-2 in the 2-30\nkeV energy band and (3.3 +2.9/-1.7) x 10-7 erg cm-2 in the 30-400 keV\nenergy band.  The ratio of the fluences in the two energy bands is 2.5,\nclearly making this burst an X-Ray Flash.\n\nThe T50 and T90 durations of XRF 040912 are 80 +/-5 sec and 127 +/-13\nsec in the 6-40 keV energy band, and 81 +/-5 sec and 122 +/-7 sec in the\n6-80 keV energy band, respectively.\n\nThis message may be cited.",
  "subject": "XRF 040912 (=H3557):  Spectral and Temporal Properties",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov>",
  "bibcode": "2004GCN..2723....1O",
  "circularId": 2723,
  "createdOn": 1095452223000,
  "editedOn": 1777053011402,
  "version": 2
}