Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-26
Astronomy and Astrophysics
Astrophysics
8 pages, 2 figures and 4 tables. To appear in MNRAS
Scientific paper
10.1111/j.1365-2966.2008.13504.x
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.
Bhattacharya Dipen
Kamble Atish
Misra Kuntal
Sagar Ram
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