GRB early afterglow observations with the REM robotic telescope

SD Vergani; S. Covino; Daniele Malesani; C. Guidorzi; P. D'Avanzo; E. Palazzi

doi:10.3938/jkps.56.1598

GRB early afterglow observations with the REM robotic telescope

SD Vergani, S. Covino, Daniele Malesani, C. Guidorzi, P. D'Avanzo, E. Palazzi

Abstract

Gamma-ray bursts (GRBs) are thought to be produced by highly relativistic outflows. Although upper and lower limits for the outflow initial Lorentz factor Γ0 are available, observational efforts to derive a direct determination of Γ0 have so far failed or have provided ambiguous results. As a matter of fact, the shape of the early-time afterglow light curve is very sensitive to Γ0, which determines the time of the afterglow peak, i.e., when the outflow and the shocked circumburst material share a, comparable amount of energy. We now comment on the early-time observations of the near-infrared afterglows of GRB 060418 and GRB 060607A performed by the (REM) robotic telescope. For both events, the afterglow peak was singled out, which allowed us to determine the initial fireball Lorentz, Γ0 - 400.

Originalsprog	Engelsk
Tidsskrift	Journal of the Korean Physical Society
Vol/bind	56
Udgave nummer	5, Part 1 Sp.Iss. Sl
Sider (fra-til)	1598-1602
Antal sider	4
ISSN	0374-4884
DOI	https://doi.org/10.3938/jkps.56.1598
Status	Udgivet - 14 maj 2010

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10.3938/jkps.56.1598

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title = "GRB early afterglow observations with the REM robotic telescope",

abstract = "Gamma-ray bursts (GRBs) are thought to be produced by highly relativistic outflows. Although upper and lower limits for the outflow initial Lorentz factor Γ0 are available, observational efforts to derive a direct determination of Γ0 have so far failed or have provided ambiguous results. As a matter of fact, the shape of the early-time afterglow light curve is very sensitive to Γ0, which determines the time of the afterglow peak, i.e., when the outflow and the shocked circumburst material share a, comparable amount of energy. We now comment on the early-time observations of the near-infrared afterglows of GRB 060418 and GRB 060607A performed by the (REM) robotic telescope. For both events, the afterglow peak was singled out, which allowed us to determine the initial fireball Lorentz, Γ0 - 400.",

author = "SD Vergani and S. Covino and Daniele Malesani and C. Guidorzi and P. D'Avanzo and E. Palazzi",

year = "2010",

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doi = "10.3938/jkps.56.1598",

language = "English",

volume = "56",

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T1 - GRB early afterglow observations with the REM robotic telescope

AU - Vergani, SD

AU - Covino, S.

AU - Malesani, Daniele

AU - Guidorzi, C.

AU - D'Avanzo, P.

AU - Palazzi, E.

PY - 2010/5/14

Y1 - 2010/5/14

N2 - Gamma-ray bursts (GRBs) are thought to be produced by highly relativistic outflows. Although upper and lower limits for the outflow initial Lorentz factor Γ0 are available, observational efforts to derive a direct determination of Γ0 have so far failed or have provided ambiguous results. As a matter of fact, the shape of the early-time afterglow light curve is very sensitive to Γ0, which determines the time of the afterglow peak, i.e., when the outflow and the shocked circumburst material share a, comparable amount of energy. We now comment on the early-time observations of the near-infrared afterglows of GRB 060418 and GRB 060607A performed by the (REM) robotic telescope. For both events, the afterglow peak was singled out, which allowed us to determine the initial fireball Lorentz, Γ0 - 400.

AB - Gamma-ray bursts (GRBs) are thought to be produced by highly relativistic outflows. Although upper and lower limits for the outflow initial Lorentz factor Γ0 are available, observational efforts to derive a direct determination of Γ0 have so far failed or have provided ambiguous results. As a matter of fact, the shape of the early-time afterglow light curve is very sensitive to Γ0, which determines the time of the afterglow peak, i.e., when the outflow and the shocked circumburst material share a, comparable amount of energy. We now comment on the early-time observations of the near-infrared afterglows of GRB 060418 and GRB 060607A performed by the (REM) robotic telescope. For both events, the afterglow peak was singled out, which allowed us to determine the initial fireball Lorentz, Γ0 - 400.

U2 - 10.3938/jkps.56.1598

DO - 10.3938/jkps.56.1598

M3 - Conference article

SN - 0374-4884

VL - 56

SP - 1598

EP - 1602

JO - Journal of the Korean Physical Society

JF - Journal of the Korean Physical Society

IS - 5, Part 1 Sp.Iss. Sl

ER -

GRB early afterglow observations with the REM robotic telescope

Abstract

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