Computer Science
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1065...63l&link_type=abstract
2008 NANJING GAMMA-RAY BURST CONFERENCE. AIP Conference Proceedings, Volume 1065, pp. 63-66 (2008).
Computer Science
2
Gamma-Ray Sources, Gamma-Ray Bursts, X-Ray Emission Spectra And Fluorescence, X- And Gamma-Ray Telescopes And Instrumentation
Scientific paper
An analysis of the prompt gamma-rays of the X-ray flashes (XRFs) observed with the Burst Alert Telescope (BAT) on board Swift satellite is presented. A division line of Γ = 2 (roughly corresponding to a peak energy of the vfv spectrum of ~50 keV) is adopted to separate XRFs and typical gamma-ray bursts(GRBs), where Γ is the power law index of the BAT spectrum. Among 235 bursts detected with BAT, the detection ratio of XRFs to GRBs is 42:193, consistent with the observations of HETE-2. The distribution of Γ for the entire set of the GRBs/XRFs is a normal distribution without featuring the GRBs and XRFs as two distinct groups. By comparing the gamma-ray fluences and the peak fluxes in different energy bands, it is found that the XRFs are globally softer than the GRBs, but during the peak time the spectra of both the GRBs and the XRF are similar, illustrating that the dominated radiation mechanisms are similar. These results support that XRFs are natural extensions of GRBs into the soft band.
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