We report Swift Burst Alert Telescope (BAT) observations of the X-ray Flash (XRF) XRF 050416A. The fluence ratio between the 15-25 and 25-50 keV bands of this event is 1.1, thus making it the softest gamma-ray burst (GRB) observed by BAT so far. The spectrum is well fitted by the Band function with E peak obs of 15.6 -2.7 +2.3keV. Assuming the redshift of the host galaxy (z=0.6535), the isotropic-equivalent energy E iso and the E peak energy at the GRB rest frame (E peak src) of XRF 050416A are not only consistent with the correlation found by Amati et al. and extended to XRFs by Sakamoto et al., but also fill-in the gap of this relation around 30-80 keV range of E peak src. This result tightens the validity of the E peak src-E iso relation form XRFs to GRBs.
|ホスト出版物のタイトル||AIP Conference Proceedings|
|出版ステータス||Published - 2006 5 19|
|イベント||GAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference - Washington, D.C.|
継続期間: 2005 11 29 → 2005 12 2
|Other||GAMMA-RAY BURSTS IN THE SWIFT ERA: 16th Maryland Astrophysics Conference|
|Period||05/11/29 → 05/12/2|
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