1999MNRAS.309L..13L

Query : 1999MNRAS.309L..13L

1999MNRAS.309L..13L - Mon. Not. R. Astron. Soc., 309, L13-L17 (1999/October-3)

Constraints on the bulk Lorentz factor in the internal shock scenario for gamma-ray bursts.

LAZZATI D., GHISELLINI G. and CELOTTI A.

Abstract (from CDS):

We investigate, independently of specific emission models, the constraints on the value of the bulk Lorentz factor Γ of a fireball. We assume that the burst emission comes from internal shocks in a region transparent to Thomson scattering, and before deceleration caused by the swept-up external matter is effective. We consider the role of Compton drag in decelerating fast-moving shells before they interact with slower ones, thus limiting the possible differences in the bulk Lorentz factor of shells. Tighter constraints on the possible range of Γ are derived by requiring that the internal shocks transform more than a few per cent of the bulk energy into radiation. Efficient bursts may require a hierarchical scenario, where a shell undergoes multiple interactions with other shells. We conclude that fireballs with average Lorentz factors larger than 1000 are unlikely to give rise to the observed bursts.

Abstract Copyright: 1999, Royal Astronomical Society

Journal keyword(s): gamma rays: bursts - X-rays: general

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 : 1999MNRAS.309L..13L

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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