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

Preprint

9 June 2005

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.astro-ph/0504165

Abstract

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.

Keywords

NEUTRON RICH INTERNAL
INTERNAL SHOCKS
REVERSE SHOCK
EARLY OPTICAL
041219A
FLASH
GRB

All Related Versions

Version 1, 2005-04-07, ArXiv
Version 2, 2005-06-09, ArXiv
Published version: The Astrophysical Journal, 628 (1), L25.

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