J/A+A/557/A18 GRB 120815A afterglow spectra (Kruehler+, 2013)
Molecular hydrogen in the damped Lyα system towards GRB 120815A at z=2.36
Kruehler T., Ledoux C., Fynbo J.P.U., Vreeswijk P.M., Schmidl S.,
Malesani D., Christensen L., De Cia A., Hjorth J., Jakobsson P.,
Kann D.A., Kaper L., Vergani S.D., Afonso P.M.J., Covino S.,
de Ugarte Postigo A., D'Elia V., Filgas R., Goldoni P., Greiner J.,
Hartoog O.E., Milvang-Jensen B., Nardini M., Piranomonte S., Rossi A.,
Sanchez-Ramirez R., Schady P., Schulze S., Sudilovsky V., Tanvir N.R.,
Tagliaferri G., Watson D.J., Wiersema K., Wijers R.A.M.J., Xu D.
<Astron. Astrophys. 557, A18 (2013)>
=2013A&A...557A..18K 2013A&A...557A..18K
ADC_Keywords: Gamma rays ; Spectroscopy
Keywords: gamma-ray burst: individual: GRB 120815A - galaxies: high-redshift -
ISM: molecules - dust, extinction
Abstract:
We present the discovery of molecular hydrogen (H2), including the
presence of vibrationally-excited H2*^_ in the optical spectrum of
the afterglow of GRB 120815A at z=2.36 obtained with X-shooter at the
VLT. Simultaneous photometric broad-band data from GROND and X-ray
observations by Swift/XRT place further constraints on the amount and
nature of dust along the sightline. The galactic environment of GRB
120815A is characterized by a strong DLA with would allow statistical
studies, and, coupled with host follow-up and sub-mm spectroscopy,
provide unprecedented insights into the process and conditions of
star-formation at high redshift.
Description:
Flux-calibrated VLT/X-shooter medium resolution spectrum of the
GRB 120815A afterglow.
Spectroscopic observations of the GRB 120815A afterglow in the
wavelength range between 3000 and 24800Å commenced on 2012-08-15 at
03:55 UT (6.06ks after the BAT trigger) with the cross-dispersed
echelle spectrograph Xshooter mounted at ESO's Very Large Telescope
(VLT) UT2. They consisted of four nodded exposures in the sequence
ABBA with exposure times of 600s each, taken simultaneously in
X-shooter's ultraviolet/blue (UVB - 3150-5900Å), visible (VIS -
5600-10080Å) and near-infrared (NIR - 10200-24080Å) arms with
R∼6000, 10400, 6200 for the UVB/VIS and NIR arm, respectively.
Objects:
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RA (2000) DE Designation(s)
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18 15 54.40 -52 07 29.0 GRB 120815A = GRB 120815A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
uvb.dat 32 17796 VLT/X-shooter ultra-violet/blue arm spectrum
vis.dat 32 34455 VLT/X-shooter visual arm spectrum
nir.dat 32 27755 VLT/X-shooter near-infrared arm spectrum
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See also:
J/ApJ/626/L5 : Photometric observations of GRB 041006 (Stanek+, 2005)
J/ApJ/654/L25 : Light-curve data for GRB 050319 (Huang+, 2007)
J/ApJ/686/1209 : Optical properties of GRB afterglows (Melandri+, 2008)
J/ApJ/654/L21 : GRB 060206 & GRB 060210 R-band light curves (Stanek+, 2008)
J/A+A/508/593 : GRB 080710 bright optical/NIR afterglow (Kruehler+, 2009)
J/ApJ/720/862 : Afterglow light curve of GRB 090926A (Rau+, 2010)
J/MNRAS/406/2473 : Photometry of GRB 071025 (Perley+, 2010)
J/A+A/531/A39 : g'r'i'z'JHKs light curves of GRB 081029 (Nardini+, 2011)
J/ApJ/727/73 : GRB afterglows high S/N composite spectrum
(Christensen+, 2011)
J/MNRAS/418/2202 : Analysis of γ-ray bursts (Dainotti+, 2011)
J/MNRAS/421/1874 : GRB 100901A and GRB 100906A light curves (Gorbovskoy+, 2012)
J/MNRAS/426/2 : GRB 091018 Opt/NIR photometry (Wiersema+, 2012)
Byte-by-byte Description of file: nir.dat uvb.dat vis.dat
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Bytes Format Units Label Explanations
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1- 11 F11.5 0.1nm lambda [3150/24080] Heliocentric vacuum wavelength
13- 22 E10.4 cW/m2/nm Flux Flux density (in erg/cm2/s/Å)
24- 32 E9.4 cW/m2/nm e_Flux Flux density error) (in erg/cm2/s/Å)
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Acknowledgements:
Thomas Kruehler, tom( at )dark-cosmology.dk
(End) Thomas Kruehler [Copenhagen univ.], Emmanuelle Perret [CDS] 11-Jul-2013