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GRB050904 the oldest explosion ever observed in the Early Universe and high redshift GRBs

GRB050904 the oldest explosion ever observed in the Early Universe and high redshift GRBs. GRB050904. Swift Narrow Field Instrument follow-up starts ~ 160 s after the BAT trigger. XRT Centroid RA j2000 = 00h 54m 50s.8

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GRB050904 the oldest explosion ever observed in the Early Universe and high redshift GRBs

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  1. GRB050904 the oldest explosion ever observed in the Early Universe and high redshift GRBs

  2. GRB050904 Swift Narrow Field Instrument follow-up starts ~160 s after the BAT trigger XRT Centroid RA j2000 = 00h 54m 50s.8 Decj2000= +14° 05’ 08’’.2 Redshift measurements: z=6.29 +/- 0.01 (Kawai at al 2005) z=6.3 +/- 0.07 (Tagliaferri et al. 2005) z=6.39 +/- 0.11 (Haislip et al. 2005) 890 million of years after the Big Bang

  3. Effects of the high redshift of GRB050904 on energy and time The energy ranges of the Swift instruments correspond to emission ranges larger than a factor (1+z)=7.29 BAT : 15-350 keV 109-2551 keV XRT : 0.2-10 keV 1.4 - 73 keV The observed timescales are stretched of the factor (1+z) with respect the rest frame ones This is the rest frame fastest X-ray follow-up ever performed

  4. GRB050904 flares BAT XRT- WT XRT- PC The total 1.4-73 keV fluence is 10-5 erg cm-2

  5. ~10% < 1% < 1% tr=27s td=5s tr=5s tr=5s td=5s td=11s Later flares contribute with a 15% to the total XRT fluence

  6. c/s c/s HR Rest frame Time (s)

  7. Spectral evolution

  8. 0.7 x 1054 erg < Eiso < 3.2 x 1054 erg 1.2 x 1051 erg < E < 4 x 1051 erg (Fig. by Ghirlanda et al. 2004)

  9. GRB050730 Z=3.97 flares Z=3.97

  10. GRB050505 Z=4.27

  11. GRB050814 Z=5.3

  12. Conclusion High redshift GRBs are long and intense (GRB050904, GRB050505, GRB050730 and GRB050814) and characterized by intense and late flaring activity (GRB050904 and GRB050730). This peculiarity could be related to a lower metallicity at high redshift.

  13. Gamma Ray Burst in the Swift Era – November 29th - December 2th 2005

  14. Gamma Ray Burst in the Swift Era – November 29th - December 2th 2005

  15. GRB050904 Gamma Ray Burst in the Swift Era – November 29th - December 2th 2005

  16. Gamma Ray Burst in the Swift Era – November 29th - December 2th 2005

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