Multicolor observations of the GRB 000926 afterglow

P. A. Price; F. A. Harrison; T. J. Galama; D. E. Reichart; T. S. Axelrod; E. Berger; J. S. Bloom; J. Busche; T. Cline; A. Diercks; S. G. Djorgovski; D. A. Frail; A. Gal-Yam; J. Halpern; J. A. Holtzman; M. Hunt; K. Hurley; B. Jacoby; R. Kimble; S. R. Kulkarni; N. Mirabal; G. Morrison; E. Ofek; O. Pevunova; R. Sari; B. P. Schmidt; D. Turnshek; S. Yost

doi:10.1086/319152

Multicolor observations of the GRB 000926 afterglow

P. A. Price^*, F. A. Harrison, T. J. Galama, D. E. Reichart, T. S. Axelrod, E. Berger, J. S. Bloom, J. Busche, T. Cline, A. Diercks, S. G. Djorgovski, D. A. Frail, A. Gal-Yam, J. Halpern, J. A. Holtzman, M. Hunt, K. Hurley, B. Jacoby, R. Kimble, S. R. KulkarniN. Mirabal, G. Morrison, E. Ofek, O. Pevunova, R. Sari, B. P. Schmidt, D. Turnshek, S. Yost

^*Corresponding author for this work

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

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Abstract

We present multicolor light curves of the optical afterglow of gamma-ray burst (GRB) 000926. Beginning ∼1.5 days after the burst, the light curves of this GRB steepen measurably. The existence of such achromatic breaks is usually taken to be an important observational signature that the ejecta are not expanding isotropically but rather have a collimated jetlike geometry. If we interpret the data ir this context, we derive an opening angle of 5°, which reduces the energy release compared with an isotropic model by a factor of ∼275, to 1.7 × 10⁵¹ ergs. To fit the data with a simple jet model requires extinction along the line of sight. The derived A_v is in the range 0.11-0.82 mag, depending on the adopted extinction law and whether the electrons giving rise to the optical emission are undergoing synchrotron cooling or not. Since this is in excess of the expected extinction from our Galaxy, we attribute this to the GRB host. We note that this extinction is typical of a galactic disk, and therefore the event likely took place in the disk of its host.

Original language	English
Pages (from-to)	L7-L10
Journal	Astrophysical Journal
Volume	549
Issue number	1 PART 2
DOIs	https://doi.org/10.1086/319152
State	Published - 1 Mar 2001
Externally published	Yes

Bibliographical note

Funding Information:
We thank the staff of the Palomar, Keck, MDM, and Wise Observatories and also L. Cowie, A. Barger, R. Ellis, C. Steidel, and B. Madore for their assistance in obtaining observations. We thank E. Mazets and the Konus team for the IPN data. F. A. H. acknowledges support from a Presidential Early Career award. S. R. K., S. G. D., and J. P. H. thank NSF for support of their ground-based GRB programs. K. H. is grateful for Ulysses support under JPL contract 958056 and NEAR support under NAG5-9503.

Keywords

Cosmology: Observations
Galaxies: ISM
Gamma rays: Bursts

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10.1086/319152

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Price, P. A., Harrison, F. A., Galama, T. J., Reichart, D. E., Axelrod, T. S., Berger, E., Bloom, J. S., Busche, J., Cline, T., Diercks, A., Djorgovski, S. G., Frail, D. A., Gal-Yam, A., Halpern, J., Holtzman, J. A., Hunt, M., Hurley, K., Jacoby, B., Kimble, R., ... Yost, S. (2001). Multicolor observations of the GRB 000926 afterglow. Astrophysical Journal, 549(1 PART 2), L7-L10. https://doi.org/10.1086/319152

@article{cb81f319f2624199b5a300e9103520e8,

title = "Multicolor observations of the GRB 000926 afterglow",

abstract = "We present multicolor light curves of the optical afterglow of gamma-ray burst (GRB) 000926. Beginning ∼1.5 days after the burst, the light curves of this GRB steepen measurably. The existence of such achromatic breaks is usually taken to be an important observational signature that the ejecta are not expanding isotropically but rather have a collimated jetlike geometry. If we interpret the data ir this context, we derive an opening angle of 5°, which reduces the energy release compared with an isotropic model by a factor of ∼275, to 1.7 × 1051 ergs. To fit the data with a simple jet model requires extinction along the line of sight. The derived Av is in the range 0.11-0.82 mag, depending on the adopted extinction law and whether the electrons giving rise to the optical emission are undergoing synchrotron cooling or not. Since this is in excess of the expected extinction from our Galaxy, we attribute this to the GRB host. We note that this extinction is typical of a galactic disk, and therefore the event likely took place in the disk of its host.",

keywords = "Cosmology: Observations, Galaxies: ISM, Gamma rays: Bursts",

author = "Price, {P. A.} and Harrison, {F. A.} and Galama, {T. J.} and Reichart, {D. E.} and Axelrod, {T. S.} and E. Berger and Bloom, {J. S.} and J. Busche and T. Cline and A. Diercks and Djorgovski, {S. G.} and Frail, {D. A.} and A. Gal-Yam and J. Halpern and Holtzman, {J. A.} and M. Hunt and K. Hurley and B. Jacoby and R. Kimble and Kulkarni, {S. R.} and N. Mirabal and G. Morrison and E. Ofek and O. Pevunova and R. Sari and Schmidt, {B. P.} and D. Turnshek and S. Yost",

note = "Funding Information: We thank the staff of the Palomar, Keck, MDM, and Wise Observatories and also L. Cowie, A. Barger, R. Ellis, C. Steidel, and B. Madore for their assistance in obtaining observations. We thank E. Mazets and the Konus team for the IPN data. F. A. H. acknowledges support from a Presidential Early Career award. S. R. K., S. G. D., and J. P. H. thank NSF for support of their ground-based GRB programs. K. H. is grateful for Ulysses support under JPL contract 958056 and NEAR support under NAG5-9503.",

year = "2001",

month = mar,

day = "1",

doi = "10.1086/319152",

language = "אנגלית",

volume = "549",

pages = "L7--L10",

journal = "Astrophysical Journal",

issn = "0004-637X",

publisher = "IOP Publishing Ltd.",

number = "1 PART 2",

}

Price, PA, Harrison, FA, Galama, TJ, Reichart, DE, Axelrod, TS, Berger, E, Bloom, JS, Busche, J, Cline, T, Diercks, A, Djorgovski, SG, Frail, DA, Gal-Yam, A, Halpern, J, Holtzman, JA, Hunt, M, Hurley, K, Jacoby, B, Kimble, R, Kulkarni, SR, Mirabal, N, Morrison, G, Ofek, E, Pevunova, O, Sari, R, Schmidt, BP, Turnshek, D & Yost, S 2001, 'Multicolor observations of the GRB 000926 afterglow', Astrophysical Journal, vol. 549, no. 1 PART 2, pp. L7-L10. https://doi.org/10.1086/319152

TY - JOUR

T1 - Multicolor observations of the GRB 000926 afterglow

AU - Price, P. A.

AU - Harrison, F. A.

AU - Galama, T. J.

AU - Reichart, D. E.

AU - Axelrod, T. S.

AU - Berger, E.

AU - Bloom, J. S.

AU - Busche, J.

AU - Cline, T.

AU - Diercks, A.

AU - Djorgovski, S. G.

AU - Frail, D. A.

AU - Gal-Yam, A.

AU - Halpern, J.

AU - Holtzman, J. A.

AU - Hunt, M.

AU - Hurley, K.

AU - Jacoby, B.

AU - Kimble, R.

AU - Kulkarni, S. R.

AU - Mirabal, N.

AU - Morrison, G.

AU - Ofek, E.

AU - Pevunova, O.

AU - Sari, R.

AU - Schmidt, B. P.

AU - Turnshek, D.

AU - Yost, S.

N1 - Funding Information: We thank the staff of the Palomar, Keck, MDM, and Wise Observatories and also L. Cowie, A. Barger, R. Ellis, C. Steidel, and B. Madore for their assistance in obtaining observations. We thank E. Mazets and the Konus team for the IPN data. F. A. H. acknowledges support from a Presidential Early Career award. S. R. K., S. G. D., and J. P. H. thank NSF for support of their ground-based GRB programs. K. H. is grateful for Ulysses support under JPL contract 958056 and NEAR support under NAG5-9503.

PY - 2001/3/1

Y1 - 2001/3/1

N2 - We present multicolor light curves of the optical afterglow of gamma-ray burst (GRB) 000926. Beginning ∼1.5 days after the burst, the light curves of this GRB steepen measurably. The existence of such achromatic breaks is usually taken to be an important observational signature that the ejecta are not expanding isotropically but rather have a collimated jetlike geometry. If we interpret the data ir this context, we derive an opening angle of 5°, which reduces the energy release compared with an isotropic model by a factor of ∼275, to 1.7 × 1051 ergs. To fit the data with a simple jet model requires extinction along the line of sight. The derived Av is in the range 0.11-0.82 mag, depending on the adopted extinction law and whether the electrons giving rise to the optical emission are undergoing synchrotron cooling or not. Since this is in excess of the expected extinction from our Galaxy, we attribute this to the GRB host. We note that this extinction is typical of a galactic disk, and therefore the event likely took place in the disk of its host.

AB - We present multicolor light curves of the optical afterglow of gamma-ray burst (GRB) 000926. Beginning ∼1.5 days after the burst, the light curves of this GRB steepen measurably. The existence of such achromatic breaks is usually taken to be an important observational signature that the ejecta are not expanding isotropically but rather have a collimated jetlike geometry. If we interpret the data ir this context, we derive an opening angle of 5°, which reduces the energy release compared with an isotropic model by a factor of ∼275, to 1.7 × 1051 ergs. To fit the data with a simple jet model requires extinction along the line of sight. The derived Av is in the range 0.11-0.82 mag, depending on the adopted extinction law and whether the electrons giving rise to the optical emission are undergoing synchrotron cooling or not. Since this is in excess of the expected extinction from our Galaxy, we attribute this to the GRB host. We note that this extinction is typical of a galactic disk, and therefore the event likely took place in the disk of its host.

KW - Cosmology: Observations

KW - Galaxies: ISM

KW - Gamma rays: Bursts

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U2 - 10.1086/319152

DO - 10.1086/319152

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AN - SCOPUS:0035284885

SN - 0004-637X

VL - 549

SP - L7-L10

JO - Astrophysical Journal

JF - Astrophysical Journal

IS - 1 PART 2

ER -

Multicolor observations of the GRB 000926 afterglow

Abstract

Bibliographical note

Keywords

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