INTEGRAL and XMM – Newton Observations of GRB 040106 ⋆
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چکیده
On January 6 th 2004, the IBAS burst alert system triggered the 8 th gamma–ray burst (GRB) to be located by the INTEGRAL satellite. The position was determined and publicly distributed within 12 s, prompting ESA's XMM–Newton to execute a ToO observation just 5 hours later, during which an X–ray afterglow was detected. The GRB had a duration ∼ 52 s with two distinct pulses separated by ∼ 42 s. Here we present the results of imaging and spectral analyses of the prompt emission from INTEGRAL data and the X–ray afterglow from XMM–Newton data. The γ–ray spectrum is consistent with a single power–law of photon index-1.72 ± 0.15. The fluence (20-200 keV) was 8.2 × 10 −7 erg cm −2. The X–ray afterglow (F ν (t) ∝ ν −β X t −δ) was extremely hard with β X = 0.47± 0.01 and δ = 1.46± 0.04. The 2-10 keV flux 11 hours after the burst was 1.1 × 10 −12 erg cm −2 s −1. The time profile of the GRB is consistent with the observed trends from previous analysis of BATSE GRBs. We find that the X–ray data are not well-fit by either a simple spherical fireball or by a speading jet, expanding into a homogeneous medium or a wind environment. Based on previously determined correlations between GRB spectra and redshift, we estimate a redshift of ∼ 0.9 +0.5 −0.4 (1 σ) and a lower limit on the isotropic radiated energy of ∼ 5 × 10 51 erg in this burst.
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تاریخ انتشار 2004