2009MNRAS.394..214K

Query : 2009MNRAS.394..214K

2009MNRAS.394..214K - Mon. Not. R. Astron. Soc., 394, 214-220 (2009/March-3)

Optical observations of GRB 050401 afterglow : a case for double-jet model.

KAMBLE A., MISRA K., BHATTACHARYA D. and SAGAR R.

Abstract (from CDS):

The afterglow of GRB 050401 presents several novel and interesting features. (i) An initially faster decay in optical band than in X-rays. (ii) A break in the X-ray light curve after ∼0.06d with an unusual slope after the break. (iii)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 modelled the observed multiband evolution of the afterglow of GRB 050401 as originating in a two-component jet, and 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 multiband afterglow of GRB 050401. We present optical observations of GRB 050401 using the 104-cm Sampurnanand Telescope at the Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital.
Result. of the analysis of multiband data are presented and compared with GRB 030329, the first reported case of double jet.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): gamma-rays: bursts

Nomenclature: Table 1: [KMB2009] NN (Nos 1-18).

Simbad objects: 22

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Number of rows : 22
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1261 1
3 SA 107- reg 15 39.2 -00 20           ~ 91 0
4 [KMB2009] 18 * 16 31 14.79 +02 07 14.6   18.28 17.54 17.07 16.61 ~ 1 0
5 [KMB2009] 14 * 16 31 15.08 +02 09 19.1   14.95 14.34 13.96 13.60 ~ 1 0
6 [KMB2009] 17 * 16 31 15.93 +02 07 36.6   20.07 18.91 18.02 17.16 ~ 1 0
7 [KMB2009] 16 * 16 31 17.26 +02 07 58.9   16.80 16.17 15.76 15.36 ~ 1 0
8 [KMB2009] 10 * 16 31 18.56 +02 12 40.8   16.15 15.30 14.79 14.37 ~ 1 0
9 [KMB2009] 9 * 16 31 18.94 +02 13 12.1   20.47 19.21 18.38 17.61 ~ 1 0
10 [KMB2009] 13 * 16 31 19.42 +02 09 56.3   15.15 14.60 14.24 13.91 ~ 1 0
11 [KMB2009] 1 * 16 31 20.01 +02 06 52.9   17.92 17.28 16.93 16.44 ~ 1 0
12 [KMB2009] 12 * 16 31 21.38 +02 10 43.0   16.39 15.51 14.98 14.52 ~ 1 0
13 [KMB2009] 11 * 16 31 22.46 +02 11 13.7   16.30 15.61 15.15 14.74 ~ 1 0
14 [KMB2009] 15 * 16 31 23.42 +02 09 13.7   17.05 16.39 15.95 15.56 ~ 1 0
15 [KMB2009] 2 * 16 31 23.84 +02 07 44.3   17.64 16.87 16.35 15.89 ~ 1 0
16 [KMB2009] 8 * 16 31 24.79 +02 13 35.4   20.93 19.56 18.48 17.27 ~ 1 0
17 GRB 050401 gB 16 31 28.84 +02 11 14.5           ~ 348 0
18 [KMB2009] 3 * 16 31 29.22 +02 08 13.8   18.80 17.66 16.91 16.26 ~ 1 0
19 [KMB2009] 7 * 16 31 32.61 +02 12 38.7   18.09 17.68 17.34 17.01 ~ 1 0
20 [KMB2009] 6 * 16 31 36.96 +02 11 36.5   19.20 18.23 17.61 17.11 ~ 1 0
21 [KMB2009] 4 * 16 31 37.63 +02 08 07.3   17.47 16.78 16.32 15.91 ~ 1 0
22 [KMB2009] 5 * 16 31 40.12 +02 10 30.1   16.93 16.35 15.97 15.62 ~ 1 0

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