Nardini 2011 GRB 081029较晚的时候的光学快速上升

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Title:		On the nature of the extremely fast optical rebrightening of the afterglow of GRB 081029
Authors:		Nardini, M.; Greiner, J.; Krühler, T.; Filgas, R.; Klose, S.; Afonso, P.; Clemens, C.;Guelbenzu, A. N.; Olivares E., F.; Rau, A.; Rossi, A.; Updike, A.; Küpcü Yoldaş, A.; Yoldaş, A.;Burlon, D.; Elliott, J.; Kann, D. A.
Affiliation:		AA(Università degli studi di Milano-Bicocca, Piazza della Scienza 3, 20126, Milano, Italymarco.nardini@unimib.it; Max-Planck-Institut für extraterrestrische Physik, Giessenbachstrasse, 85748, Garching, Germany), AB( )
Publication:		Astronomy & Astrophysics, Volume 531, id.A39 (A&A Homepage)
Publication Date:		07/2011
Origin:		EDP Sciences
Keywords:		techniques: photometric, gamma-ray burst: individual: GRB 081029
DOI:		10.1051/0004-6361/201116814
Bibliographic Code:		2011A&A...531A..39N

Abstract

Context. After the launch of the Swift satellite, the gamma-ray burst (GRB) optical light-curve smoothness paradigm has been questioned thanks to the faster and better sampled optical follow-up, which has unveiled a very complex behaviour. This complexity is triggering the interest of the whole GRB community. The GROND multi-channel imager is used to study optical and near-infrared (NIR) afterglows of GRBs with unprecedented optical and near-infrared temporal and spectral resolution. The GRB 081029 has a very prominent optical rebrightening event and is an outstanding example of the application of the multi-channel imager to GRB afterglows.
Aims: Here we exploit the rich GROND multi-colour follow-up of GRB 081029 combined with XRT observations to study the nature of late-time rebrightenings that appear in the optical-NIR light-curves of some GRB afterglows.
Methods: We analyse the optical and NIR observations obtained with the seven-channel Gamma-Ray burst Optical and Near-infrared Detector (GROND) at the 2.2 m MPI/ESO telescope and the X-ray data obtained with the XRT telescope on board the Swift observatory. The multi-wavelength temporal and spectral evolution is discussed in the framework of different physical models.
Results: The extremely steep optical and NIR rebrightening observed in GRB 081029 cannot be explained in the framework of the standard forward shock afterglow model. The absence of a contemporaneous X-ray rebrightening and the evidence of a strong spectral evolution in the optical-NIR bands during the rise suggest two separate components that dominate in the early and late-time light-curves, respectively. The steepness of the optical rise cannot be explained even in the framework of the alternative scenarios proposed in the literature unless a late-time activity of the central engine is assumed.Full GROND photometry of GRB 081029 is only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (130.79.128.5) or via http://cdsarc.u-strasbg.fr/viz-bin/qcat?J/A+A/531/A39

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Bibtex entry for this abstract   Preferred format for this abstract (see Preferences) · Find Similar Abstracts (with default settings below) · On-line Data · Associated Articles · Also-Read Articles (Reads History) · · Translate This Page Title: GRB 081029 g'r'i'z'JHKs light curves (Nardini+, 2011) Authors: Nardini, M.; Greiner, J.; Kruehler, T.; Filgas, R.; Klose, S.; Afonso, P.; Clemens, C.;Guelbenzu, A. N.; Olivares, E. F.; Rau, A.; Rossi, A.; Updike, A.; Kupcu Yoldas, A.; Yoldas, A.;Burlon, D.; Elliott, J.; Kann, D. A. Publication: VizieR On-line Data Catalog: J/A+A/531/A39. Originally published in: 2011A&A...531A..39N Publication Date: 05/2011 Origin: SIMBAD Objects: GRB 081029 = GRB 081029 Keywords: Gamma rays, Photometry: SDSS, Photometry: infrared Comment: phot.dat 523x33 GROND g'r'i'z'JHKs bands photometry of GRB 081029 Bibliographic Code: 2011yCat..35319039N Abstract g', r', i', z', J, H, Ks band photometry of GRB 081029 obtained with the Gamma-Ray burst Optical Near-infrared Detector (GROND) that is a seven-band simultaneous optical-NIR imager mounted on the 2.2m MPI/ESO telescope at La Silla observatory. (1 data file). Associated Articles Source Paper     Catalog Description     Bibtex entry for this abstract   Preferred format for this abstract (see Preferences)