2008A&A...480...35V


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.28CET18:10:19

2008A&A...480...35V - Astronomy and Astrophysics, volume 480, 35-43 (2008/3-2)

Detailed study of the GRB 030329 radio afterglow deep into the non-relativistic phase.

VAN DER HORST A.J., KAMBLE A., RESMI L., WIJERS R.A.M.J., BHATTACHARYA D., SCHEERS B., ROL E., STROM R., KOUVELIOTOU C., OOSTERLOO T. and ISHWARA-CHANDRA C.H.

Abstract (from CDS):

We explore the physics behind one of the brightest radio afterglows ever, GRB030329, at late times when the jet is non-relativistic. We determine the physical parameters of the blast wave and its surroundings, in particular the index of the electron energy distribution, the energy of the blast wave, and the density (structure) of the circumburst medium. We then compare our results with those from image size measurements. We observed the GRB030329 radio afterglow with the Westerbork Synthesis Radio Telescope and the Giant Metrewave Radio Telescope at frequencies from 325MHz to 8.4GHz, spanning a time range of 268-1128days after the burst. We modeled all the available radio data and derived the physical parameters. The index of the electron energy distribution is p=2.1, the circumburst medium is homogeneous, and the transition to the non-relativistic phase happens at tNR∼80days. The energy of the blast wave and density of the surrounding medium are comparable to previous findings. Our findings indicate that the blast wave is roughly spherical at tNR, and they agree with the implications from the VLBI studies of image size evolution. It is not clear from the presented dataset whether we have seen emission from the counter jet or not. We predict that the Low Frequency Array will be able to observe the afterglow of GRB030329 and many other radio afterglows, constraining the physics of the blast wave during its non-relativistic phase even further.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - radio continuum: general - radiation mechanisms: non-thermal

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 3C 48 QSO 01 37 41.2995845985 +33 09 35.079126038   16.62 16.20     ~ 2455 2
2 ICRF J054236.1+495107 Sy1 05 42 36.13789843 +49 51 07.2337251   18.45 17.80 17.210   ~ 1242 1
3 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 836 1
4 3C 241 rG 10 21 54.59 +21 59 31.2   23.5       ~ 154 0
5 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SN.IcPec 1100 2
6 CTD 74 QSO 11 25 53.71192285 +26 10 19.9786840   18.62 18.51 18.39   ~ 117 1
7 3C 286 Sy1 13 31 08.2885060664 +30 30 32.960825108   17.51 17.25     ~ 3652 1
8 SN 1998bw SN* 19 35 03.17 -52 50 46.1   14.09       SNIc 1623 2

    Equat.    Gal    SGal    Ecl

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2020.01.28-18:10:19

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