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Gamma Ray Burst Compton Tails

Gamma Ray Burst Compton Tails. Guido Barbiellini University and INFN, Trieste In collaboration with Z.Bosnjak, A.Celotti, G.Ghirlanda and F.Longo. The BATSE instrument. NaI scintillators 20 keV – 2 MeV FoV 4 . Gamma-Ray Bursts. Temporal behaviour. Spectral shape.

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Gamma Ray Burst Compton Tails

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  1. Gamma Ray Burst Compton Tails Guido Barbiellini University and INFN, Trieste In collaboration with Z.Bosnjak, A.Celotti, G.Ghirlanda and F.Longo

  2. The BATSE instrument • NaI scintillators • 20 keV – 2 MeV • FoV 4

  3. Gamma-Ray Bursts Temporal behaviour Spectral shape Spatial distribution

  4. Jet and Energy Requirements Bloom et al. (2003)

  5. X-ray Lines GRB 030227 Watson et al. (2003)

  6. SN- GRB connection SN evidence SN 1998bw - GRB 980425 chance coincidence O(10-4) (Galama et al. 98)

  7. GRB 030329: the “smoking gun”? (Matheson et al. 2003)

  8. Collapsar model Woosley (1993) • Very massive star that collapses in a rapidly spinning BH. • Identification with SN explosion.

  9. GRB: the Compton tail GRB020813 (credits to CXO/NASA)

  10. GRB tails Connaughton 2002

  11. The Compton Tail Barbiellini et al. (2004) MNRAS 350, L5

  12. The Compton tail • “Prompt” luminosity • Compton “Reprocessed” luminosity • “Q” ratio

  13. Bright and Dim GRB Q = cts/peak cts (Connaughton 2002) • BRIGHT GRB  DIM GRB

  14. Bright and Dim Bursts • Bright bursts (peak counts >1.5 cm-2 s-1) • Q = 4.0  0.8 10-4 (5 ) •  = 1.3 • Dim bursts (peak counts < 0.75 cm-2 s-1 ) • Q = 5.6  1.4 10-3 (4 ) •  =2.8 • Mean fluence ratio = 11 • “Compton” correction • Corrected fluence ratio = 2.8 • A cosmological effect?

  15. GRB for Cosmology Ghirlanda et al. (2004)

  16. GRB for Cosmology Dai, Liang & Xu (2004)

  17. GRB for Cosmology Luminosity distance Preliminary Redshift

  18. GRB for Cosmology Luminosity distance Preliminary Redshift

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