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Study and Modelling of 021004 and 050408

Study and Modelling of 021004 and 050408. Antonio de Ugarte Postigo IAA-CSIC (Granada, Spain). Santorini, 1st Sept. 2005. GRB 021004 Modelled by multiple energy injections. Discovery I. Detected by HETE-II on 4th October 2002 at 12:06:13.57 UT. Duration of ~100 s.

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Study and Modelling of 021004 and 050408

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  1. Study and Modelling of 021004 and 050408 Antonio de Ugarte Postigo IAA-CSIC (Granada, Spain) Santorini, 1st Sept. 2005

  2. GRB 021004Modelled by multiple energy injections

  3. Discovery I • Detected by HETE-II on 4th October 2002 at 12:06:13.57 UT. • Duration of ~100 s. • Position transmited to Earth 49 s after the begining of the burst. • First observations began 3 min after t0. http://space.mit.edu/HETE/Bursts/GRB021004/

  4. Discovery II • Detected at R~15.3. • Position reported 3 hours after the begining of the event (Fox et al. 2002). • High redshift event still at R~17 at t0 + 4h. • Photometry, spectroscopy, polarimetry.

  5. Spectroscopy • Fast detection allowed to take high resolution spectra few hours after the event. • Z=2.3293 • Luminosity distance 18.2 Gpc • Lookback time 10.4 Gyr (79.5 % of the present Universe age) Castro Tirado et al. 2005

  6. VIS/NIR Observations

  7. Millimetre Observations

  8. Host Galaxy Starburst Galaxy ~15 Myr MB=-22.0±0.3 AV=0.06±0.08

  9. Energy Injection Model • Developed by G. Björnsson, G. Jóhannesson and E.H. Gudmundsson and based on the standard Fireball model by Sari et al. (1998) modified by adding multiple energy injections. • Several shells are released simultaneously with different Lorentz factors. • The fastest shell drives the initial afterglow and decelerates. • The slower shells finally catch up with the decelerated shock front adding up to it and producing an energy injection.

  10. Model Parameters

  11. Light Curve Fitting

  12. Spectral Energy Distribution

  13. Conclusions • 7 energy injection episodes. • Total burst energy of 7.8·1051 ergs. • Collimated jet with 1º.8 half opening angle. • Host galaxy is a MB=-22.0±0.3 with low extinction AV=0.06±0.08.

  14. GRB 050408 t0 + 5.4 hr

  15. GRB050408: Discovery • Detected by HETE-II. • Afterglow discovered at R~20.9 with images obtained in the 1m and 6m telescopes at SAO (Russia) ~2h after the burst. • Spectra shows a redshift of z=1.2356 (Berger et al. 2005).

  16. GRB 050408: Light Curve

  17. GRB 050408 bump?

  18. GRB 050408 bump??

  19. GRB 050408 bump???

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