伽玛暴(Gamma-Ray Burst)笔记。记录有关伽玛暴的新文章,另外也包括看的老文章、自己的想法、以及跟天文相关的一些东西。 Feel free to leave me a message by comments or by email.

星期二, 十二月 19, 2006

de Ugarte Postigo 2006 GRB 050408的多波段观测

主要内容:


精彩摘抄:


文章信息:

astro-ph/0612545 [abs, ps, pdf, other] :
Title: Extensive multiband study of the X-ray rich GRB 050408. A likely off-axis event with an intense energy injection
Authors: A de Ugarte Postigo, T.A. Fatkhullin, G. Johannesson, J. Gorosabel, V.V. Sokolov, A.J. Castro-Tirado, Yu.Yu. Balega, O.I. Spiridonova, M. Jelinek, S. Guziy, D. Perez-Ramirez, J. Hjorth, P. Laursen, D. Bersier, S.B. Pandey, M. Bremer, A. Monfardini, K.Y. Huang, Y. Urata, W.H. Ip, T. Tamagawa, D. Kinoshita, T. Mizuno, Y. Arai, H. Yamagishi, T. Soyano, F. Usui, M. Tashiro, K. Abe, K. Onda, Z. Aslan, I. Khamitov, T. Ozisik, U. Kiziloglu, I. Bikmaev, N. Sakhibullin, R. Burenin, M. Pavlinsky, R. Sunyaev, D. Bhattacharya, A.P. Kamble, C.H. Ishwara Chandra, S.A. Trushkin
Comments: 9 pages, 4 figures, Accepted for publication in A&A Letters

Aims. Understand the shape and implications of the multiband light curve of GRB 050408, an X-ray rich (XRR) burst. Methods. We present a multiband optical light curve, covering the time from the onset of the gamma-ray event to several months after, when we only detect the host galaxy. Together with X-ray, millimetre and radio observations we compile what, to our knowledge, is the most complete multiband coverage of an XRR burst afterglow to date. Results. The optical and X-ray light curve is characterised by an early flattening and an intense bump peaking around 6 days after the burst onset. We explain the former by an off-axis viewed jet, in agreement with the predictions made for XRR by some models, and the latter with an energy injection equivalent in intensity to the initial shock. The analysis of the spectral flux distribution reveals an extinction compatible with a low chemical enrichment surrounding the burst. Together with the detection of an underlying starburst host galaxy we can strengthen the link between XRR and classical long-duration bursts.

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