Götz, D. 2011 GRB 041219A的详细研究

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Title:		A detailed spectral study of GRB 041219A and its host galaxy
Authors:		Götz, D.; Covino, S.; Hascoët, R.; Fernandez-Soto, A.; Daigne, F.; Mochkovitch, R.; Esposito, P.
Affiliation:		AA(AIM (UMR 7158 CEA/DSM-CNRS-Université Paris Diderot) Irfu/Service d'Astrophysique, Saclay, F-91191 Gif-sur-Yvette Cedex, France), AB(INAF - Osservatorio Astronomico di Brera, Via E. Bianchi 46, 23807 Merate (LC), Italy), AC(Institut d'Astrophysique de Paris, UMR 7095 Université Pierre et Marie Curie-Paris 6 - CNRS, 98 bis boulevard Arago, 75014 Paris, France), AD(Instituto de Fisica de Cantabria, CSIC-Universidad Cantabria, Avenida de los Castros s/n, 39005 Santander, Spain), AE(Institut d'Astrophysique de Paris, UMR 7095 Université Pierre et Marie Curie-Paris 6 - CNRS, 98 bis boulevard Arago, 75014 Paris, France; Institut Universitaire de France), AF(Institut d'Astrophysique de Paris, UMR 7095 Université Pierre et Marie Curie-Paris 6 - CNRS, 98 bis boulevard Arago, 75014 Paris, France), AG(INAF - Osservatorio Astronomico di Cagliari, località Poggio dei Pini, strada 54, I-09012 Capoterra, Italy)
Publication:		Monthly Notices of the Royal Astronomical Society, Volume 413, Issue 3, pp. 2173-2183. (MNRAS Homepage)
Publication Date:		05/2011
Origin:		WILEY
Astronomy Keywords:		gamma-ray burst: general, gamma-ray burst: individual: GRB 041219A, galaxies: photometry
Abstract Copyright:		© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:		10.1111/j.1365-2966.2011.18290.x
Bibliographic Code:		2011MNRAS.413.2173G

Abstract

GRB 041219A is one of the longest and brightest gamma-ray bursts (GRBs) ever observed. It was discovered by the INTEGRAL satellite, and thanks to a precursor happening about 300 s before the bulk of the burst, ground-based telescopes were able to catch the rarely observed prompt emission in the optical and in the near-infrared bands.

Here we present the detailed analysis of its prompt gamma-ray emission, as observed with IBIS onboard INTEGRAL, and of the available X-ray afterglow data collected by X-Ray Telescope onboard Swift. We then present the late-time multiband near-infrared imaging data, collected at the Telescopio Nazionale Galileo (TNG) and the Canada-France-Hawaii Telescope (CFHT), that allowed us to identify the host galaxy of the GRB as an underluminous, irregular galaxy of ˜5 × 10⁹ M_sun at best-fitting redshift of z= 0.31^+0.54_-0.26.

We model the broad-band prompt optical to gamma-ray emission of GRB 041219A within the internal shock model. We were able to reproduce the spectra and light curve invoking the synchrotron emission of relativistic electrons accelerated by a series of propagating shock waves inside a relativistic outflow. On the other hand, it is less easy to simultaneously reproduce the temporal and spectral properties of the infrared data.

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