GRB 090313 and the origin of optical peaks in gamma-ray burst light curves

Implications for Lorentz factors and radio flares

A. Melandri, S. Kobayashi, C. G. Mundell, C. Guidorzi, A. De Ugarte Postigo, G. Pooley, M. Yoshida, D. Bersier, A. J. Castro-Tirado, M. Jelínek, A. Gomboc, J. Gorosabel, P. Kubánek, M. Bremer, J. M. Winters, I. A. Steele, I. De Gregorio-Monsalvo, R. J. Smith, D. Garćia-Appadoo, A. Sota & 1 others A. Lundgren

Research output: Contribution to journalArticle

47 Citations (Scopus)

Abstract

We use a sample of 19 gamma-ray bursts (GRBs) that exhibit single-peaked optical light curves to test the standard fireball model by investigating the relationship between the time of the onset of the afterglow and the temporal rising index. Our sample includes GRBs and X-ray flashes for which we derive a wide range of initial Lorentz factors (40 < Γ < 450). Using plausible model parameters, the typical frequency of the forward shock is expected to lie close to the optical band; within this low typical frequency framework, we use the optical data to constrain ∈e and show that values derived from the early time light-curve properties are consistent with published typical values derived from other afterglow studies. We produce expected radio light curves by predicting the temporal evolution of the expected radio emission from forward and reverse shock components, including synchrotron self-absorption effects at early time. Although a number of GRBs in this sample do not have published radio measurements, we demonstrate the effectiveness of this method in the case of Swift GRB 090313, for which millimetric and centimetric observations were available, and conclude that future detections of reverse-shock radio flares with new radio facilities such as the EVLA and ALMA will test the low-frequency model and provide constraints on magnetic models.

Original languageEnglish
Pages (from-to)1331-1342
Number of pages12
JournalAstrophysical Journal
Volume723
Issue number2
DOIs
Publication statusPublished - 21 Oct 2010

Fingerprint

gamma ray bursts
flares
light curve
radio
shock
afterglows
low frequencies
self absorption
fireballs
radio emission
flash
synchrotrons
temporal evolution
x rays
test

Keywords

  • Gamma-ray burst
  • General

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

GRB 090313 and the origin of optical peaks in gamma-ray burst light curves : Implications for Lorentz factors and radio flares. / Melandri, A.; Kobayashi, S.; Mundell, C. G.; Guidorzi, C.; De Ugarte Postigo, A.; Pooley, G.; Yoshida, M.; Bersier, D.; Castro-Tirado, A. J.; Jelínek, M.; Gomboc, A.; Gorosabel, J.; Kubánek, P.; Bremer, M.; Winters, J. M.; Steele, I. A.; De Gregorio-Monsalvo, I.; Smith, R. J.; Garćia-Appadoo, D.; Sota, A.; Lundgren, A.

In: Astrophysical Journal, Vol. 723, No. 2, 21.10.2010, p. 1331-1342.

Research output: Contribution to journalArticle

Melandri, A, Kobayashi, S, Mundell, CG, Guidorzi, C, De Ugarte Postigo, A, Pooley, G, Yoshida, M, Bersier, D, Castro-Tirado, AJ, Jelínek, M, Gomboc, A, Gorosabel, J, Kubánek, P, Bremer, M, Winters, JM, Steele, IA, De Gregorio-Monsalvo, I, Smith, RJ, Garćia-Appadoo, D, Sota, A & Lundgren, A 2010, 'GRB 090313 and the origin of optical peaks in gamma-ray burst light curves: Implications for Lorentz factors and radio flares', Astrophysical Journal, vol. 723, no. 2, pp. 1331-1342. https://doi.org/10.1088/0004-637X/723/2/1331
Melandri, A. ; Kobayashi, S. ; Mundell, C. G. ; Guidorzi, C. ; De Ugarte Postigo, A. ; Pooley, G. ; Yoshida, M. ; Bersier, D. ; Castro-Tirado, A. J. ; Jelínek, M. ; Gomboc, A. ; Gorosabel, J. ; Kubánek, P. ; Bremer, M. ; Winters, J. M. ; Steele, I. A. ; De Gregorio-Monsalvo, I. ; Smith, R. J. ; Garćia-Appadoo, D. ; Sota, A. ; Lundgren, A. / GRB 090313 and the origin of optical peaks in gamma-ray burst light curves : Implications for Lorentz factors and radio flares. In: Astrophysical Journal. 2010 ; Vol. 723, No. 2. pp. 1331-1342.
@article{9372a2280d364a84849a5b95ac7365ce,
title = "GRB 090313 and the origin of optical peaks in gamma-ray burst light curves: Implications for Lorentz factors and radio flares",
abstract = "We use a sample of 19 gamma-ray bursts (GRBs) that exhibit single-peaked optical light curves to test the standard fireball model by investigating the relationship between the time of the onset of the afterglow and the temporal rising index. Our sample includes GRBs and X-ray flashes for which we derive a wide range of initial Lorentz factors (40 < Γ < 450). Using plausible model parameters, the typical frequency of the forward shock is expected to lie close to the optical band; within this low typical frequency framework, we use the optical data to constrain ∈e and show that values derived from the early time light-curve properties are consistent with published typical values derived from other afterglow studies. We produce expected radio light curves by predicting the temporal evolution of the expected radio emission from forward and reverse shock components, including synchrotron self-absorption effects at early time. Although a number of GRBs in this sample do not have published radio measurements, we demonstrate the effectiveness of this method in the case of Swift GRB 090313, for which millimetric and centimetric observations were available, and conclude that future detections of reverse-shock radio flares with new radio facilities such as the EVLA and ALMA will test the low-frequency model and provide constraints on magnetic models.",
keywords = "Gamma-ray burst, General",
author = "A. Melandri and S. Kobayashi and Mundell, {C. G.} and C. Guidorzi and {De Ugarte Postigo}, A. and G. Pooley and M. Yoshida and D. Bersier and Castro-Tirado, {A. J.} and M. Jel{\'i}nek and A. Gomboc and J. Gorosabel and P. Kub{\'a}nek and M. Bremer and Winters, {J. M.} and Steele, {I. A.} and {De Gregorio-Monsalvo}, I. and Smith, {R. J.} and D. Garćia-Appadoo and A. Sota and A. Lundgren",
year = "2010",
month = "10",
day = "21",
doi = "10.1088/0004-637X/723/2/1331",
language = "English",
volume = "723",
pages = "1331--1342",
journal = "Astrophysical Journal",
issn = "0004-637X",
publisher = "IOP Publishing",
number = "2",

}

TY - JOUR

T1 - GRB 090313 and the origin of optical peaks in gamma-ray burst light curves

T2 - Implications for Lorentz factors and radio flares

AU - Melandri, A.

AU - Kobayashi, S.

AU - Mundell, C. G.

AU - Guidorzi, C.

AU - De Ugarte Postigo, A.

AU - Pooley, G.

AU - Yoshida, M.

AU - Bersier, D.

AU - Castro-Tirado, A. J.

AU - Jelínek, M.

AU - Gomboc, A.

AU - Gorosabel, J.

AU - Kubánek, P.

AU - Bremer, M.

AU - Winters, J. M.

AU - Steele, I. A.

AU - De Gregorio-Monsalvo, I.

AU - Smith, R. J.

AU - Garćia-Appadoo, D.

AU - Sota, A.

AU - Lundgren, A.

PY - 2010/10/21

Y1 - 2010/10/21

N2 - We use a sample of 19 gamma-ray bursts (GRBs) that exhibit single-peaked optical light curves to test the standard fireball model by investigating the relationship between the time of the onset of the afterglow and the temporal rising index. Our sample includes GRBs and X-ray flashes for which we derive a wide range of initial Lorentz factors (40 < Γ < 450). Using plausible model parameters, the typical frequency of the forward shock is expected to lie close to the optical band; within this low typical frequency framework, we use the optical data to constrain ∈e and show that values derived from the early time light-curve properties are consistent with published typical values derived from other afterglow studies. We produce expected radio light curves by predicting the temporal evolution of the expected radio emission from forward and reverse shock components, including synchrotron self-absorption effects at early time. Although a number of GRBs in this sample do not have published radio measurements, we demonstrate the effectiveness of this method in the case of Swift GRB 090313, for which millimetric and centimetric observations were available, and conclude that future detections of reverse-shock radio flares with new radio facilities such as the EVLA and ALMA will test the low-frequency model and provide constraints on magnetic models.

AB - We use a sample of 19 gamma-ray bursts (GRBs) that exhibit single-peaked optical light curves to test the standard fireball model by investigating the relationship between the time of the onset of the afterglow and the temporal rising index. Our sample includes GRBs and X-ray flashes for which we derive a wide range of initial Lorentz factors (40 < Γ < 450). Using plausible model parameters, the typical frequency of the forward shock is expected to lie close to the optical band; within this low typical frequency framework, we use the optical data to constrain ∈e and show that values derived from the early time light-curve properties are consistent with published typical values derived from other afterglow studies. We produce expected radio light curves by predicting the temporal evolution of the expected radio emission from forward and reverse shock components, including synchrotron self-absorption effects at early time. Although a number of GRBs in this sample do not have published radio measurements, we demonstrate the effectiveness of this method in the case of Swift GRB 090313, for which millimetric and centimetric observations were available, and conclude that future detections of reverse-shock radio flares with new radio facilities such as the EVLA and ALMA will test the low-frequency model and provide constraints on magnetic models.

KW - Gamma-ray burst

KW - General

UR - http://www.scopus.com/inward/record.url?scp=78650161682&partnerID=8YFLogxK

U2 - 10.1088/0004-637X/723/2/1331

DO - 10.1088/0004-637X/723/2/1331

M3 - Article

VL - 723

SP - 1331

EP - 1342

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

ER -