2002MNRAS.336.1271D

Query : 2002MNRAS.336.1271D

2002MNRAS.336.1271D - Mon. Not. R. Astron. Soc., 336, 1271-1280 (2002/November-2)

The expected thermal precursors of gamma-ray bursts in the internal shock model.

DAIGNE F. and MOCHKOVITCH R.

Abstract (from CDS):

The prompt emission of gamma-ray bursts probably comes from a highly relativistic wind which converts part of its kinetic energy into radiation via the formation of shocks within the wind itself. Such `internal shocks' can occur if the wind is generated with a highly non-uniform distribution of the Lorentz factor. We estimate the expected photospheric emission of such a relativistic wind when it becomes transparent. We compare this thermal emission (temporal profile + spectrum) with the non-thermal emission produced by the internal shocks. In most cases, we predict a rather bright thermal emission that should already have been detected. This favours acceleration mechanisms for the wind where the initial energy input is under magnetic rather than thermal form. Such scenarios can produce thermal X-ray precursors comparable to those observed by Ginga and WATCH/GRANAT.

Abstract Copyright: RAS

Journal keyword(s): hydrodynamics - radiation mechanisms: non-thermal - radiation mechanisms: thermal - relativity - gamma-rays: bursts.

Simbad objects: 1

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Number of rows : 1
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 1012 1

Query : 2002MNRAS.336.1271D

Basic data :
GRB 990123 -- Gamma-ray Burst
Other object types: otypes_help 		gB (GRB,Trigger,...), V* (AAVSO), X (SAX)
ICRS coord. (ep=J2000) : 		15 25 29.0 +44 45 00 (Gamma-ray) [ ] E 2015ApJ...807...76L
FK4 coord. (ep=B1950 eq=1950) : 		15 23 47.0 +44 55 28 [ ]
Gal coord. (ep=J2000) : 		073.0921 +54.6461 [ ]
Radial velocity / Redshift / cz : 		V(km/s) 222526 [~] / z(~) 1.6 [~] / cz 479668 [~]
   D 2006A&A...447..499V
Fluxes (1) :
V 8.95 [~] E ~
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Identifiers (6) :
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GRB 990123 Trigger 7343 [STK2001] 11201d
SAX J1525.5+4446 XRF 990123 AAVSO 1522+45

References (1012 between 1850 and 2026) (Total 1012)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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