J/A+A/620/A119 GRB 161023A light curves and EW (de Ugarte Postigo+, 2018)
X-shooter and ALMA spectroscopy of GRB 161023A.
A study of metals and molecules in the line of sight towards a luminous GRB.
de Ugarte Postigo A., Thoene C.C., Bolmer J., Schulze S., Martin S.,
Kann D.A., D'Elia V., Selsing J., Martin-Carrillo A., Perley D.A., Kim S.,
Izzo L., Sanchez-Ramirez R., Guidorzi C., Klotz A., Wiersema K., Bauer F.E.,
Bensch K., Campana S., Cano Z., Covino S., Coward D., De Cia A.,
de Gregorio-Monsalvo I., De Pasquale M., Fynbo J.P.U., Greiner J.,
Gomboc A., Hanlon L., Hansen M., Hartmann D.H., Heintz K.E., Jakobsson P.,
Kobayashi S., Malesani D.B., Martone R., Meintjes P.J., Michalowski M.J.,
Mundell C.G., Murphy D., Oates S., Salmon L., van Soelen B., Tanvir N.R.,
Turpin D., Xu D., Zafar T.
<Astron. Astrophys. 620, A119 (2018)>
=2018A&A...620A.119D 2018A&A...620A.119D (SIMBAD/NED BibCode)
ADC_Keywords: GRB ; Photometry, SDSS ; Photometry, infrared ; Equivalent widths
Keywords: gamma ray bursts: individual: GRB161023A - techniques: spectroscopic -
ISM: abundances - ISM: molecules - galaxies: ISM - submillimeter: ISM
Abstract:
Long gamma-ray bursts (GRBs) are produced during the dramatic deaths
of massive stars with very short lifetimes, meaning that they explode
close to the birth place of their progenitors. Over a short period
they become the most luminous objects observable in the Universe,
being perfect beacons to study high-redshift star-forming regions.
We aim to use the afterglow of GRB161023A at a redshift z=2.710 as a
background source to study the environment of the explosion and the
intervening systems along its line of sight.
For the first time, we complement ultraviolet (UV), optical and
near-infrared (NIR) spectroscopy with millimetre spectroscopy using
the Atacama Large Millimeter Array (ALMA), which allows us to probe
the molecular content of the host galaxy. The X-shooter spectrum shows
a plethora of absorption features including fine-structure and
metastable transitions of Fe, Ni, Si, C, and O. We present photometry
ranging from 43s to over 500 days after the burst
Description:
GRB161023A was first identified by INTEGRAL (INTErnational Gamma-Ray
Astrophysics Laboratory) as a long gamma-ray burst that triggered the
IBIS (Imager on-Board the INTEGRAL Satellite) detector at 22:38:40 UT
on 23 October 2016 (Mereghetti et al., 2016GCN.20103....1M 2016GCN.20103....1M), which we
use as the trigger reference time T0.
The X-shooter spectrograph, installed on ESO's Very Large Telescope
(Chile) observed the optical counterpart of GRB161023A at a mean epoch
2.795hrs after the burst.The observation consisted of 2x600s exposures
covering the spectral range between 3000 and 24800Å.
In the X-shooter spectrum we identify numerous absorption features
(see tablea2.dat).
We present the observations performed with the 0.4m Watcher telescope,
the 0.25m TAROT La Silla telescope, the 2.0m Faulkes South telescope,
the 1.0m Zadko Gingin telescope, and the 2.2m MPG telescope with
GROND. Our photometric data set also includes an r'-band observation
obtained during the acquisition of the X-shooter spectrum at ESO's
Very Large Telescope (VLT). We have added observations obtained using
the FORS2 (FOcal Reducer/low dispersion Spectrograph 2) instrument at
the VLT as part of a different programme (Wiersema et al. in prep.).
Finally, we include a deep observation obtained with FORS2 in March
2018 in search of the host galaxy, which remains undetected down to a
strong 3-σ limit of 26.5mag. The photometry of all these data
was obtained based on Sloan magnitudes of secondary standard stars
based on GROND observations of SDSS (Sloan Digital Sky Survey) fields.
In the case of FORS2 the observations performed with the Rspecial
filter were calibrated directly with the Sloan r'. The photometric
data are presented in tablea1.dat.
Objects:
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RA (2000) DE Designation(s)
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20 44 05.20 -47 39 48.5 GRB161023A = GRB 161023A
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File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
tablea1.dat 72 213 Optical/NIR observations
tablea2.dat 50 115 *Equivalent widths of the spectral features
measured in the X-shooter spectrum
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Note on tablea2.dat: This list does not include features within the
Lyman-α forest.
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.5 d T-T0 Days after the burst (T-T0)
11- 27 A17 --- Tel Telescope/Instrument (1)
29- 42 A14 ---- Band Band (2)
45 A1 --- l_mag Limit flag on mag
46- 50 F5.2 mag mag Magnitude in Band (AB) (3)
52- 55 F4.2 mag e_mag ? rms uncertainty on mag
57 A1 --- l_Flux Limit flag on Flux
58- 65 F8.2 uJy Flux Flux density in Band (4)
67- 72 F6.2 uJy e_Flux ? rms uncertainty on Flux
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Note (1): Telescope/Instrument are:
0.25mTAROT, 0.4mWatcher, 0.8mSpitzer/IRAC, 1.0mZadko-Gingin, 2.0mFaulkes,
2.2mMPG/GROND, 8.2mVLT/FORS2 and 8.2mVLT/X-shooter.
Note (2): Observed bands are:
gp (for g'), ip (for i'), rp (for r'), zp (for z'), JHKS,
Clear(rp) (for Clear(r')), Rspecial(rp) (for Rspecial(r')) and 3.6µm.
Note (3): Magnitudes (in the AB system) are as observed without correction
for Galactic extinction.
Note (4): Flux densities have been corrected for Galactic extinction.
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Byte-by-byte Description of file: tablea2.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 7 F7.1 0.1nm lambda ? Wavelength (Angstroem)
9- 29 A21 --- Feat Feature
31- 37 F7.5 --- z Redshift
39- 43 F5.3 0.1nm EW ? Equivalent widths of the spectral feature
(Angstroem)
46- 50 F5.3 0.1nm e_EW ? rms uncertainty on EW
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Acknowledgements:
Antonio de Ugarte Postigo, deugarte(at)iaa.es
(End) Patricia Vannier [CDS] 11-Oct-2018