J/A+A/646/A50 GRB 190829A/SN 2019oyw spectra (Hu+, 2021)
10.4 m GTC observations of the nearby VHE-detected GRB 190829A/SN 2019oyw.
Hu Y.-D., Castro-Tirado A.J., Kumar A., Gupta R., Valeev A.F., Pandey S.B.,
Kann D.A., Castellon A., Agudo I., Aryan A., Caballero-Garcia M.D.,
Guziy S., Martin-Carrillo A., Oates S.R., Pian E., Sanchez-Ramirez R.,
Sokolov V.V., Zhang B.-B.
<Astron. Astrophys. 646, A50 (2021)>
=2021A&A...646A..50H 2021A&A...646A..50H (SIMBAD/NED BibCode)
ADC_Keywords: Supernovae ; Gamma rays ; Spectroscopy
Keywords: gamma-ray bursts: general -
gamma-ray bursts: individual: GRB 190829A -
supernovae: individual: SN 2019oyw
Abstract:
Gamma-ray burst (GRB) 190829A (z=0.0785) was detected by Fermi and
Swift and also at very high energy (VHE) by the High-Energy
Stereoscopic System (H.E.S.S.) telescopes. The prompt emission
displayed two emission episodes separated by a quiescent gap of ∼40s.
We present the 10.4m Gran Telescopio CANARIAS (GTC) observations of
the afterglow of GRB 190829A and its underlying supernova. We also
compare GRB190829A to GRB180728A, a GRB with similar behaviour, and
discuss the implications on underlying physical mechanisms producing
these two GRBs.
We present multi-band photometric data along with spectroscopic
follow-up observations taken with the 10.4m GTC telescope. Together
with the data from the prompt emission, the 10.4m GTC data are used
to understand the emission mechanisms and possible progenitor.
A detailed analysis of the multi-band observations of the afterglow
requires the cooling frequency to pass between the optical and X-ray
bands at early epochs. The afterglow then transitions to the
underlying supernova (SN) 2019oyw, which dominates later on.
Although the prompt emission temporal properties of GRB 190829A and
GRB 180728A are similar, the two pulses are different in the spectral
domain. We find that SN 2019oyw associated with GRB 190829A is powered
by Ni decay and is a Type Ic-BL SN. The spectroscopic and photometric
properties of this SN are consistent with those observed for SN
1998bw, but evolved earlier.
Description:
On 29 August 2019 at T0=19:55:53 UT, Fermi triggered on GRB190829A,
which at T0+51s was also triggered by the Burst Alert Telescope (BAT)
onboard Swift. We observed this event with Gran Telescopio CANARIAS
(GTC) equipped with OSIRIS at four different epochs (∼0.32d, 1.29d,
2.23d and 4.09d post-burst in rest-frame) and determine its redshift
z=0.0785. Here we supply those reduced spectroscopy of GRB 190829A
taken from GTC in ASCII format (before correction for redshift,
extinction, and also not been scaled with the photometric fluxes).
Those spectra already been mentioned in Table 2 and plotted in Figure
3 and Figure 4 after analysis process in the paper.
Objects:
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RA (2000) DE Designation(s)
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02 58 10.58 -08 57 29.8 GRB 190829A = GRB 190829A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
list.dat 77 10 List of spectra
sp/* . 10 Individual 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- 12 F12.6 d Date Observation date (JD-2400000)
14- 26 A13 --- Inst Instrument
28- 34 A7 --- ExpTime Exposure time
36- 77 A42 --- FileName Name of the spectrum file in subdirectory sp
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Byte-by-byte Description of file: sp/*
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Bytes Format Units Label Explanations
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1- 12 F12.6 0.1nm lambda Observed wavelength
15- 27 E13.6 0.1mW/m2/nm Flux Flux (in erg/s/cm2/Å)
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Acknowledgements:
You-Dong Hu, huyoudong072(at)hotmail.com
(End) Patricia Vannier [CDS] 28-Nov-2020