J/A+A/580/A139 GRB 130606A VLT/X-shooter spectroscopy (Hartoog+, 2015)
VLT/X-shooter spectroscopy of the afterglow of the Swift GRB 130606A.
Hartoog O.E., Malesani D., Fynbo J.P.U., Goto T., Kruhler T.,
Vreeswijk P.M., De Cia A., Xu D., Moller P., Covino S., D'Elia V.,
Flores H., Goldoni P., Hjorth J., Jakobsson P., Krogager J.-K., Kaper L.,
Ledoux C., Levan A.J., Milvang-Jensen B., Sollerman J., Sparre M.,
Tagliaferri G., Tanvir N.R., de Ugarte Postigo A., Vergani S.D.,
Wiersema K., Datson J., Salinas R., Mikkelsen K., Aghanim N.
<Astron. Astrophys. 580, A139 (2015)>
=2015A&A...580A.139H 2015A&A...580A.139H
ADC_Keywords: Gamma rays ; Spectra, infrared ; Spectroscopy
Keywords: gamma-ray bursts: individual: GRB 130606A - cosmology: observations -
dark ages, reionisation, first stars - ISM: abundances
Abstract:
The reionisation of the Universe is a process that is thought to have
ended around z∼6, as inferred from spectroscopy of distant bright
background sources, such as quasars (QSO) and gamma-ray burst (GRB)
afterglows. Furthermore, spectroscopy of a GRB afterglow provides
insight in its host galaxy, which is often too dim and distant to
study otherwise.
For the Swift GRB 130606A at z=5.913 we have obtained a high S/N
spectrum covering the full optical and near-IR wavelength region at
intermediate spectral resolution with VLT/X-Shooter. We aim to measure
the degree of ionisation of the intergalactic medium (IGM) between
z=5.02-5.84 and to study the chemical abundance pattern and dust
content of its host galaxy.
We estimated the UV continuum of the GRB afterglow using a power-law
extrapolation, then measured the flux decrement due to absorption at
Lyα,β, and γ wavelength regions. Furthermore, we
fitted the shape of the red damping wing of Lyα. The hydrogen
and metal absorption lines formed in the host galaxy were fitted with
Voigt profiles to obtain column densities. We investigated whether
ionisation corrections needed to be applied.
Description:
Reduced visual (VIS) and Near-IR (NIR) VLT/X-shooter spectra (before
normalization) of the afterglow of GRB130606A (Pipeline produced, see
headers of the fits files for additional info).
The original data files and calibrations can be found on
http://archive.eso.org/wdb/wdb/eso/xshooter/form
under program 091.C-0934(C)
querying the following coordinates:
coord1 = 16 37 35.188
coord2 = +29 47 47.03
Objects:
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RA (2000) DE Designation(s)
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16 37 35.12 +29 47 46.4 GRB 130606A = GRB 130606A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 162 16 List of fits spectra
fits/* . 16 Individual fits spectra
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Byte-by-byte Description of file: list.dat
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Bytes Format Units Label Explanations
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1- 5 I5 --- Nx Number of pixels along X-axis
7 I1 --- Nsp Number of spectra in the file (1)
9- 18 A10 "YYYY-DD-MM" Obs.date Observation date (2013-06-07)
19 A1 --- --- [T]
20- 32 A13 "h:m:s" Obs.time Observation time
34- 40 F7.2 nm lam.min [533/1066] Lower value of wavelength
interval
42- 48 F7.2 nm lam.max [1019/2480] Upper value of wavelength
interval
50- 53 F4.2 nm dlam [0.02/0.05] Spectral resolution
55- 57 I3 Kibyte size Size of FITS file
59-120 A62 --- FileName Name of FITS file, in subdirectory fits
122-162 A41 --- Title Title of the file
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Note (1): For individual observations (xsh*), spectrum, error and quality.
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Acknowledgements:
Olga Hartoog, olgahartoog(at)gmail.com
(End) Patricia Vannier [CDS] 22-Jun-2015