2003A&A...408..941J


C.D.S. - SIMBAD4 rel 1.7 - 2021.01.18CET12:14:54

2003A&A...408..941J - Astronomy and Astrophysics, volume 408, 941-947 (2003/9-4)

The afterglow and the host galaxy of GRB 011211.

JAKOBSSON P., HJORTH J., FYNBO J.P.U., GOROSABEL J., PEDERSEN K., BURUD I., LEVAN A., KOUVELIOTOU C., TANVIR N., FRUCHTER A., RHOADS J., GRAV T., HANSEN M.W., MICHELSEN R., ANDERSEN M.I., JENSEN B.L., PEDERSEN H., THOMSEN B., WEIDINGER M., BHARGAVI S.G., COWSIK R. and PANDEY S.B.

Abstract (from CDS):

We 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 α1=-0.95±0.02, and a post-break slope of α2=-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 β=-0.56±0.19 reddened by an SMC-like extinction law with a modest AV=0.08±0.08mag. By comparison, from the XMM-Newton X-ray data at around the same time, we find a decay index of αX=-1.62±0.36 and a spectral index of βX=-1.21+0.10–0.15. Interpolating between the UV-optical and X-ray implies that the cooling frequency is located close to ∼1016Hz 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.

Abstract Copyright:

Journal keyword(s): cosmology: observations - gamma rays: bursts - stars: supernovae: general - ISM: dust, extinction

Nomenclature: Table 2: [JHF2003] A (Nos A-H).

Simbad objects: 11

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Number of rows : 11

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 USNO-A2.0 0675-11425773 * 11 15 07.5203486091 -21 56 51.944615184   17.824 17.158     ~ 1 0
2 USNO-A2.0 0675-11426276 * 11 15 11.0308627116 -21 56 09.759872599   17.128 16.479     ~ 1 0
3 USNO-A2.0 0675-11426385 * 11 15 11.8597084218 -21 57 30.913566183   19.069 17.520     ~ 1 0
4 USNO-A2.0 0675-11426505 * 11 15 12.7927859744 -21 58 03.281970955   17.507 16.481     ~ 1 0
5 USNO-A2.0 0675-11426693 * 11 15 14.1919378816 -21 58 06.172541987   17.292 16.392     ~ 1 0
6 GRB 011211 gB 11 15 16 -21 56.0           ~ 288 0
7 [FJM2003] S1211-6 G 11 15 17.98 -21 56 56.2           ~ 16 0
8 USNO-A2.0 0675-11427359 * 11 15 18.9931674186 -21 58 04.862916279   18.479 18.002     ~ 4 0
9 USNO-A2.0 0675-11427398 * 11 15 19.2273596970 -21 55 14.378007283   18.768 18.130     ~ 1 0
10 USNO-A2.0 0675-11427668 * 11 15 21.3542223818 -22 00 06.083231331   20.874 19.446     ~ 1 0
11 GRB 000926 gB 17 04 15 +51 46.0           ~ 343 0

    Equat.    Gal    SGal    Ecl

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2021.01.18-12:14:54

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