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e±-rich GRB Fireball and Infrared Flashes

  • Zhuo Li (a1), Z. G. Dai (a1) and T. Lu (a1)

Abstract

Gamma-ray bursts (GRBs) are believed to originate from ultra-relativistic fireballs, with initial Lorentz factor η ∼ 102 − 103. However very high energy photons may still suffer from γγ interaction. We show here that in a wide range of model parameters, the resulting pairs may dominate electrons associated with the fireball baryons. This may provide an explanation for the rarity of prompt optical detections. A rapid response to the GRB trigger at the IR band would detect such a strong flash.

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References

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Briggs, M. S., et al. 1999, ApJ, 524, 82
Lithwick, Y., & Sari, R. 2001, ApJ, 555, 540
Mészáros, P. 2002, ARA&A, 40, 137
Sari, R., & Piran, T. 1999, ApJ, 517, L109
Wang, X. Y., Dai, Z. G., & Lu, T. 2000, MNRAS, 319, 1159

e±-rich GRB Fireball and Infrared Flashes

  • Zhuo Li (a1), Z. G. Dai (a1) and T. Lu (a1)

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