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arXiv · 0806.4270

Optical Observations of GRB 050401 Afterglow : A case for Double Jet Model

Atish Kamble·Kuntal Misra·D. Bhattacharya·Ram Sagar
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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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Atish Kamble, Kuntal Misra, D. Bhattacharya, Ram Sagar. 2008-06-26. Optical Observations of GRB 050401 Afterglow : A case for Double Jet Model. https://doi.org/10.1111/j.1365-2966.2008.13504.x

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