2004A&A...427..785J


C.D.S. - SIMBAD4 rel 1.7 - 2020.02.28CET10:33:59

2004A&A...427..785J - Astronomy and Astrophysics, volume 427, 785-794 (2004/12-1)

The line-of-sight towards GRB 030429 at z=2.66: Probing the matter at stellar, galactic and intergalactic scales.

JAKOBSSON P., HJORTH J., FYNBO J.P.U., WEIDINGER M., GOROSABEL J., LEDOUX C., WATSON D., BJOERNSSON G., GUDMUNDSSON E.H., WIJERS R.A.M.J., MOLLER P., PEDERSEN K., SOLLERMAN J., HENDEN A.A., JENSEN B.L., GILMORE A., KILMARTIN P., LEVAN A., CASTRO CERON J.M., CASTRO-TIRADO A.J., FRUCHTER A., KOUVELIOTOU C., MASETTI N. and TANVIR N.

Abstract (from CDS):

We report the discovery of the optical afterglow (OA) of the long-duration gamma-ray burst GRB 030429, and present a comprehensive optical/near-infrared dataset used to probe the matter at different distance scales, i.e. in the burst environment, in the host galaxy and in an intervening absorber. A break in the afterglow light curve is seen approximately 1 day from the onset of the burst. The light curve displays a significant deviation from a simple broken power-law with a bright 1.5 mag bump with a duration of 2-3 days. The optical/near-infrared spectral energy distribution is best fit with a power-law with index β=-0.36±0.12 reddened by an SMC-like extinction law with (a modest) AV=0.34±0.04. In addition, we present deep spectroscopic observations obtained with the Very Large Telescope. The redshift measured via metal absorption lines in the OA is z=2.658±0.004. Based on the damped Lyα absorption line in the OA spectrum we measure the HI column density to be logN(HI)=21.6±0.2. This confirms the trend that GRBs tend to be located behind very large HI column densities. The resulting dust-to-gas ratio is consistent with that found in the SMC, indicating a low metallicity and/or a low dust-to-metal ratio in the burst environment. We find that a neighbouring galaxy, at a separation of only 1.2", has z=0.841±0.001, ruling it out as the host of GRB 030429. The small impact parameter of this nearby galaxy, which is responsible for MgII absorption in the OA spectrum, is in contrast to previous identifications of most QSO absorption-selected galaxy counterparts. Finally, we demonstrate that the OA was not affected by strong gravitational lensing via the nearby galaxy.

Abstract Copyright:

Journal keyword(s): gamma rays: bursts - galaxies: distances and redshifts - galaxies: high-redshift - ISM: dust, extinction - quasars: absorption lines

Nomenclature: Table 2: [JHF2004] JHHMM.m+DDMM.m N=1.

Simbad objects: 21

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Number of rows : 21

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 [MFH2002] GRB 021004 abs 1.3806 ALS 00 26 54.68 +18 55 41.6           ~ 4 0
2 GRB 021004 gB 00 26 54.68 +18 55 41.6           ~ 511 1
3 [MFH2002] GRB 021004 abs 1.6039 ALS 00 26 54.68 +18 55 41.6           ~ 4 0
4 GRB 000911 gB 02 18 42 +07 48.0           ~ 146 0
5 GRB 991216 gB 05 09 31.2983 +11 17 07.262           ~ 403 1
6 [VRH99] GRB 991216 abs 0.77 ALS 05 09 31.30 +11 17 07.3           ~ 3 0
7 [VRH99] GRB 991216 abs 0.80 ALS 05 09 31.30 +11 17 07.3           ~ 3 0
8 GRB 970508 gB 06 53 49.2 +79 16 19           ~ 837 1
9 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SN.IcPec 1103 2
10 GRB 011211 gB 11 15 16 -21 56.0           ~ 284 1
11 GRB 030226 gB 11 33 04.9 +25 53 56           ~ 185 2
12 [PFD2003] GRB 030226 abs 1.043 ALS 11 33 04.9 +25 53 56           ~ 2 0
13 [JHF2004] J1213.1-2054.8 G 12 13.1 -20 55     23.70     ~ 3 0
14 GRB 030429 gB 12 13 07.495 -20 54 49.54           ~ 119 1
15 [MPP2003] Galaxy 1 G 13 58 03.01 -31 22 24.7           ~ 3 1
16 [MPP2003] Galaxy 2 G 13 58 03.12 -31 22 22.2           ~ 2 1
17 GRB 020405 gB 13 58 03.12 -31 22 22.2   21.9 21.5     ~ 232 1
18 [MHK2002] GRB 010222 abs 0.92747 ALS 14 52 12.55 +43 01 06.3           ~ 2 0
19 [MHK2002] GRB 010222 abs 1.15628 ALS 14 52 12.55 +43 01 06.3           ~ 2 0
20 GRB 010222 gB 14 52 12.55 +43 01 06.3           ~ 334 2
21 GRB 000301C gB 16 20 18.5 +29 26 35           ~ 339 2

    Equat.    Gal    SGal    Ecl

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2020.02.28-10:33:59

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