The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability

D. Bersier; K. Z. Stanek; J. N. Winn; T. Grav; M. J. Holman; T. Matheson; B. Mochejska; D. Steeghs; A. R. Walker; P. M. Garnavich; J. Quinn; S. Jha; K. H. Cook; W. W. Craig; P. J. Meintjes; J. J. Calitz

doi:10.1086/373888

The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability

D. Bersier, K. Z. Stanek, J. N. Winn, T. Grav, M. J. Holman, T. Matheson, B. Mochejska, D. Steeghs, A. R. Walker, P. M. Garnavich, J. Quinn, S. Jha, K. H. Cook, W. W. Craig, P. J. Meintjes, J. J. Calitz

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Abstract

We report UBVRI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (∼10%-20%) deviations from a power-law decay on several timescales, ranging from a few hours down to 20-30 minutes. We also observed a significant color change starting ∼1.5 days after the burst, confirming the spectroscopic results already reported by Matheson et al. We discuss these results in the context of several models that have recently been proposed to account for the anomalous photometric behavior of this event.

Original language	English (US)
Pages (from-to)	L43-L46
Journal	Astrophysical Journal
Volume	584
Issue number	2 II
DOIs	https://doi.org/10.1086/373888
State	Published - Feb 20 2003
Externally published	Yes

All Science Journal Classification (ASJC) codes

Astronomy and Astrophysics
Space and Planetary Science

Keywords

Gamma rays: bursts

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10.1086/373888

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Bersier, D., Stanek, K. Z., Winn, J. N., Grav, T., Holman, M. J., Matheson, T., Mochejska, B., Steeghs, D., Walker, A. R., Garnavich, P. M., Quinn, J., Jha, S., Cook, K. H., Craig, W. W., Meintjes, P. J., & Calitz, J. J. (2003). The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability. Astrophysical Journal, 584(2 II), L43-L46. https://doi.org/10.1086/373888

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title = "The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability",

abstract = "We report UBVRI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (∼10%-20%) deviations from a power-law decay on several timescales, ranging from a few hours down to 20-30 minutes. We also observed a significant color change starting ∼1.5 days after the burst, confirming the spectroscopic results already reported by Matheson et al. We discuss these results in the context of several models that have recently been proposed to account for the anomalous photometric behavior of this event.",

keywords = "Gamma rays: bursts",

author = "D. Bersier and Stanek, {K. Z.} and Winn, {J. N.} and T. Grav and Holman, {M. J.} and T. Matheson and B. Mochejska and D. Steeghs and Walker, {A. R.} and Garnavich, {P. M.} and J. Quinn and S. Jha and Cook, {K. H.} and Craig, {W. W.} and Meintjes, {P. J.} and Calitz, {J. J.}",

year = "2003",

month = feb,

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doi = "10.1086/373888",

language = "English (US)",

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Bersier, D, Stanek, KZ, Winn, JN, Grav, T, Holman, MJ, Matheson, T, Mochejska, B, Steeghs, D, Walker, AR, Garnavich, PM, Quinn, J, Jha, S, Cook, KH, Craig, WW, Meintjes, PJ & Calitz, JJ 2003, 'The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability', Astrophysical Journal, vol. 584, no. 2 II, pp. L43-L46. https://doi.org/10.1086/373888

TY - JOUR

T1 - The unusual optical afterglow of the gamma-ray burst GRB 021004

T2 - Color changes and short-timescale variability

AU - Bersier, D.

AU - Stanek, K. Z.

AU - Winn, J. N.

AU - Grav, T.

AU - Holman, M. J.

AU - Matheson, T.

AU - Mochejska, B.

AU - Steeghs, D.

AU - Walker, A. R.

AU - Garnavich, P. M.

AU - Quinn, J.

AU - Jha, S.

AU - Cook, K. H.

AU - Craig, W. W.

AU - Meintjes, P. J.

AU - Calitz, J. J.

PY - 2003/2/20

Y1 - 2003/2/20

N2 - We report UBVRI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (∼10%-20%) deviations from a power-law decay on several timescales, ranging from a few hours down to 20-30 minutes. We also observed a significant color change starting ∼1.5 days after the burst, confirming the spectroscopic results already reported by Matheson et al. We discuss these results in the context of several models that have recently been proposed to account for the anomalous photometric behavior of this event.

AB - We report UBVRI observations of the optical afterglow of the gamma-ray burst GRB 021004. We observed significant (∼10%-20%) deviations from a power-law decay on several timescales, ranging from a few hours down to 20-30 minutes. We also observed a significant color change starting ∼1.5 days after the burst, confirming the spectroscopic results already reported by Matheson et al. We discuss these results in the context of several models that have recently been proposed to account for the anomalous photometric behavior of this event.

KW - Gamma rays: bursts

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U2 - 10.1086/373888

DO - 10.1086/373888

M3 - Article

AN - SCOPUS:18244426785

SN - 0004-637X

VL - 584

SP - L43-L46

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 2 II

ER -

The unusual optical afterglow of the gamma-ray burst GRB 021004: Color changes and short-timescale variability

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