The afterglow and the host galaxy of GRB 011211

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dc.creatorJakobsson, P.
dc.creatorHjorth, J.
dc.creatorFynbo, J. P. U.
dc.creatorGorosabel, J.
dc.creatorPedersen, K.
dc.creatorBurud, I.
dc.creatorLevan, A.
dc.creatorKouveliotou, C.
dc.creatorTanvir, N.
dc.creatorFruchter, A.
dc.creatorRhoads, J.
dc.creatorGrav, T.
dc.creatorHansen, M. W.
dc.creatorMichelsen, R.
dc.creatorAndersen, M. I.
dc.creatorJensen, B. L.
dc.creatorPedersen, H.
dc.creatorThomsen, B.
dc.creatorWeidinger, M.
dc.creatorBhargavi, S. G.
dc.creatorCowsik, R.
dc.creatorPandey, S. B.
dc.date2003-07-10
dc.date.accessioned2026-07-07T12:00:55Z
dc.date.available2026-07-07T12:00:55Z
dc.descriptionWe present optical, near-infrared, and X-ray observations of the optical afterglow (OA) of the X-ray rich, long-duration gamma-ray burst GRB 011211. Hubble Space Telescope (HST) data obtained 14, 26, 32, and 59 days after the burst, show the host galaxy to have a morphology that is fairly typical of blue galaxies at high redshift. We measure its magnitude to be R = 24.95 +/- 0.11. We detect a break in the OA R-band light curve which is naturally accounted for by a collimated outflow geometry. By fitting a broken power-law to the data we find a best fit with a break 1.56 +/- 0.02 days after the burst, a pre-break slope of alpha_1 = -0.95 +/- 0.02, and a post-break slope of alpha_2 = -2.11 +/- 0.07. The UV-optical spectral energy distribution (SED) around 14 hours after the burst is best fit with a power-law with index beta = -0.56 +/- 0.19 reddened by an SMC-like extinction law with a modest A_V = 0.08 +/- 0.08 mag. By comparison, from the XMM-Newton X-ray data at around the same time, we find a decay index of alpha_X = -1.62 +/- 0.36 and a spectral index of beta_X = -1.21 +0.10/-0.15. Interpolating between the UV-optical and X-ray implies that the cooling frequency is located close to ~10^16 Hz in the observer frame at the time of the observations. We argue, using the various temporal and spectral indices above, that the most likely afterglow model is that of a jet expanding into an external environment that has a constant mean density rather than a wind-fed density structure. We estimate the electron energy index for this burst to be p ~ 2.3.
dc.description7 pages, 4 figures. Accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/0307222
dc.identifierhttp://arxiv.org/abs/astro-ph/0307222
dc.identifierAstron.Astrophys.408:941-947,2003
dc.identifierdoi:10.1051/0004-6361:20031044
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/206944
dc.subjectAstrophysics
dc.titleThe afterglow and the host galaxy of GRB 011211
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