The spectroscopic variability of GRB 021004

T. Matheson; P. M. Garnavich; C. Foltz; S. West; G. Williams; E. Falco; M. L. Calkins; F. J. Castander; E. Gawiser; S. Jha; D. Bersier; K. Z. Stanek

doi:10.1086/367601

The spectroscopic variability of GRB 021004

T. Matheson, P. M. Garnavich, C. Foltz, S. West, G. Williams, E. Falco, M. L. Calkins, F. J. Castander, E. Gawiser, S. Jha, D. Bersier, K. Z. Stanek

Research output: Contribution to journal › Article › peer-review

36 Scopus citations

Abstract

We present spectra of the optical transient (OT) associated with GRB 021004. The spectra show a blue continuum with superposed absorption features and one emission line. We confirm two intervening metal-line systems at z = 1.380 and z = 1.602 and one very strong absorption system at a redshift of z = 2.323. Lyα emission is also seen at this redshift. While the spectrum of the OT overall cannot be simply described with a power law, the spectral index over the range 5500-8850 Å is steep, F_v ∝ v- ^0.93±0.03. Comparison of spectra from multiple epochs shows a distinct color evolution with the OT becoming redder with time over the first 3 days. This is the first clear example of color change in an OT detected spectroscopically.

Original language	English (US)
Pages (from-to)	L5-L9
Journal	Astrophysical Journal
Volume	582
Issue number	1 II
DOIs	https://doi.org/10.1086/367601
State	Published - Jan 1 2003
Externally published	Yes

Keywords

Galaxies: ISM
Galaxies: distances and redshifts
Gamma rays: bursts
Ultraviolet: galaxies

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/367601

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title = "The spectroscopic variability of GRB 021004",

abstract = "We present spectra of the optical transient (OT) associated with GRB 021004. The spectra show a blue continuum with superposed absorption features and one emission line. We confirm two intervening metal-line systems at z = 1.380 and z = 1.602 and one very strong absorption system at a redshift of z = 2.323. Lyα emission is also seen at this redshift. While the spectrum of the OT overall cannot be simply described with a power law, the spectral index over the range 5500-8850 {\AA} is steep, Fv ∝ v- 0.93±0.03. Comparison of spectra from multiple epochs shows a distinct color evolution with the OT becoming redder with time over the first 3 days. This is the first clear example of color change in an OT detected spectroscopically.",

keywords = "Galaxies: ISM, Galaxies: distances and redshifts, Gamma rays: bursts, Ultraviolet: galaxies",

author = "T. Matheson and Garnavich, {P. M.} and C. Foltz and S. West and G. Williams and E. Falco and Calkins, {M. L.} and Castander, {F. J.} and E. Gawiser and S. Jha and D. Bersier and Stanek, {K. Z.}",

note = "Funding Information: 11IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.",

year = "2003",

month = jan,

day = "1",

doi = "10.1086/367601",

language = "English (US)",

volume = "582",

pages = "L5--L9",

journal = "Astrophysical Journal",

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T1 - The spectroscopic variability of GRB 021004

AU - Matheson, T.

AU - Garnavich, P. M.

AU - Foltz, C.

AU - West, S.

AU - Williams, G.

AU - Falco, E.

AU - Calkins, M. L.

AU - Castander, F. J.

AU - Gawiser, E.

AU - Jha, S.

AU - Bersier, D.

AU - Stanek, K. Z.

N1 - Funding Information: 11IRAF is distributed by the National Optical Astronomy Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under cooperative agreement with the National Science Foundation.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - We present spectra of the optical transient (OT) associated with GRB 021004. The spectra show a blue continuum with superposed absorption features and one emission line. We confirm two intervening metal-line systems at z = 1.380 and z = 1.602 and one very strong absorption system at a redshift of z = 2.323. Lyα emission is also seen at this redshift. While the spectrum of the OT overall cannot be simply described with a power law, the spectral index over the range 5500-8850 Å is steep, Fv ∝ v- 0.93±0.03. Comparison of spectra from multiple epochs shows a distinct color evolution with the OT becoming redder with time over the first 3 days. This is the first clear example of color change in an OT detected spectroscopically.

AB - We present spectra of the optical transient (OT) associated with GRB 021004. The spectra show a blue continuum with superposed absorption features and one emission line. We confirm two intervening metal-line systems at z = 1.380 and z = 1.602 and one very strong absorption system at a redshift of z = 2.323. Lyα emission is also seen at this redshift. While the spectrum of the OT overall cannot be simply described with a power law, the spectral index over the range 5500-8850 Å is steep, Fv ∝ v- 0.93±0.03. Comparison of spectra from multiple epochs shows a distinct color evolution with the OT becoming redder with time over the first 3 days. This is the first clear example of color change in an OT detected spectroscopically.

KW - Galaxies: ISM

KW - Galaxies: distances and redshifts

KW - Gamma rays: bursts

KW - Ultraviolet: galaxies

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U2 - 10.1086/367601

DO - 10.1086/367601

M3 - Article

AN - SCOPUS:0038190903

VL - 582

SP - L5-L9

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 1 II

ER -

The spectroscopic variability of GRB 021004

Abstract

Keywords

ASJC Scopus subject areas

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