Kamble 2008 GRB 050401的光学余辉

主要内容:
也有和X射线不一致的拐折。解释为双成分的喷流。

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· arXiv e-print (arXiv:0806.4270)

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Title:		Optical Observations of GRB 050401 Afterglow : A case for Double Jet Model
Authors:		Kamble, Atish; Misra, Kuntal; Bhattacharya, D.; Sagar, Ram
Publication:		eprint arXiv:0806.4270
Publication Date:		06/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		8 pages, 2 figures and 4 tables. To appear in MNRAS
Bibliographic Code:		2008arXiv0806.4270K

Abstract

The afterglow of GRB 050401 presents several novel and interesting features : [1] An initially faster decay in optical band than in X-rays. [2] A break in the X-ray light curve after $\sim$ 0.06 day with an unusual slope after the break. [3] The X-ray afterglow does not show any spectral evolution across the break while the R band light curve does not show any break. We have modeled the observed multi-band evolution of the afterglow of GRB 050401 as originating in a two component jet, interpreting the break in X-ray light curve as due to lateral expansion of a narrow collimated outflow which dominates the X-ray emission. The optical emission is attributed to a wider jet component. Our model reproduces all the observed features of multi-band afterglow of GRB 050401. We present optical observations of GRB 050401 using the 104-cm Sampurnanand Telescope at ARIES, Nainital. Results of the analysis of multi-band data are presented and compared with GRB 030329, the first reported case of double jet.

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