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20 April 2024

» arxiv » astro-ph/0503508

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A contemporaneous infrared flash from a long gamma-ray burst: an echo from the central engine
C. H. Blake ; J. S. Bloom ; D. L. Starr ; E. E. Falco ; M. Skrutskie ; E. E. Fenimore ; G. Duchene ; A. Szentgyorgyi ; S. Hornstein ; J. X. Prochaska ; C. McCabe ; A. Ghez ; Q. Konopacky ; K. Stapelfeldt ; K. Hurley ; R. Campbell ; M. Kassis ; F. Chaffee ; N. Gehrels ; S. Barthelmy ; J. R. Cummings ; D. Hullinger ; H. A. Krimm ; C. B. Markwardt ; D. Palmer ; A. Parsons ; K. McLean ; J. Tueller ;
Date:	23 Mar 2005
Journal:	Nature 435 (2005) 181-184
Subject:	astro-ph
Abstract:	The explosion that results in a cosmic gamma-ray burst (GRB) is thought to produce emission from two physical processes -- the activity of the central engine gives rise to the high-energy emission of the burst through internal shocking and the subsequent interaction of the flow with the external environment produces long-wavelength afterglow. While afterglow observations continue to refine our understanding of GRB progenitors and relativistic shocks, gamma-ray observations alone have not yielded a clear picture of the origin of the prompt emission nor details of the central engine. Only one concurrent visible-light transient has been found and was associated with emission from an external shock. Here we report the discovery of infrared (IR) emission contemporaneous with a GRB, beginning 7.2 minutes after the onset of GRB 041219a. Our robotic telescope acquired 21 images during the active phase of the burst, yielding the earliest multi-colour observations of any long-wavelength emission associated with a GRB. Analysis of an initial IR pulse suggests an origin consistent with internal shocks. This opens a new possibility to study the central engine of GRBs with ground-based observations at long wavelengths.
Source:	arXiv, astro-ph/0503508
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