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

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

2005-04-06

arxiv.org/abs/astro-ph/0504165v2

Astrophys.J. 628 (2005) L25-L28

Astronomy and Astrophysics

Astrophysics

4 pages, including 2 figures, accepted for publication in ApJL (shortened to match the page limit)

Scientific paper

10.1086/432616

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.

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