Early optical-IR emission from GRB 041219a: Neutron-rich internal shocks and a mildly magnetized external reverse shock

Apr, 2005
12 pages
Published in:
  • Astrophys.J.Lett. 628 (2005) L25-L28
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Abstract: (arXiv)
Very early optical and near infrared (IR) emission was discovered accompanying the long gamma-ray burst (GRB) 041219a. We show that the optical/IR flash tracking the gamma-ray lightcurve during the prompt emission could be understood as emission from neutron-rich internal shocks, as has been suggested by Fan & Wei. The early K_s-band afterglow lightcurve after the prompt phase could be well-modeled as the superposition of a reverse shock and a forward shock component. The radio data also support the reverse shock interpretation.
  • gamma rays: bursts
  • ISM: jets and outflows
  • radiation mechanisms: nonthermal