2006A&A...447..499V


C.D.S. - SIMBAD4 rel 1.7 - 2021.02.28CET20:40:37

2006A&A...447..499V - Astronomy and Astrophysics, volume 447, 499-513 (2006/2-4)

Slow and fast components in the X-ray light curves of gamma-ray bursts.

VETERE L., MASSARO E., COSTA E., SOFFITTA P. and VENTURA G.

Abstract (from CDS):

Gamma-ray burst light curves show quite different patterns: from very simple to extremely complex. We present a temporal and spectral study of the light curves in three energy bands (2-5, 5-10, 10-26keV) of ten GRBs detected by the Wide Field Cameras on board BeppoSAX. For some events the time profiles are characterized by peaks superposed on a slowly evolving pedestal, which in some cases becomes less apparent at higher energies. We describe this behaviour with the presence of two components (slow and fast) having different variability time scales. We modelled the time evolution of slow components by means of an analytical function able to describe asymmetric rising and decaying profiles. The residual light curves, after the subtraction of the slow components, generally show structures more similar to the original curves in the highest energy band. Spectral study of these two components was performed evaluating their hardness ratios, used also to derive photon indices. Slow components are found generally softer than the fast ones suggesting that their origin is likely different. Being typical photon indices lower than those of the afterglows there is no evidence that the emission processes are similar. Another interesting possibility is that slow components can be related to the presence of a hot photosphere having a thermal spectrum with kT around a few keV superposed to a rapid variable non-thermal emission of the fast component.

Abstract Copyright:

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

Simbad objects: 14

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Number of rows : 14

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 GRB 990705 gB 05 09 54.5 -72 07 53           ~ 216 1
2 GRB 990908 gB 06 53 -73.0           ~ 7 0
3 GRB 990907 gB 07 33.7 -69 47           ~ 19 0
4 SN 2003dh SN* 10 44 50.030 +21 31 18.15     16.2     SNIcpec 1130 1
5 GRB 000528 gB 10 45 08.0 -33 59 26           ~ 27 0
6 GRB 990704 gB 12 19 27.3 -03 50 22           ~ 50 0
7 GRB 010222 G 14 52 12.5 +43 01 06           ~ 337 1
8 GRB 990123 gB 15 25 29 +44 45.0     8.95     ~ 966 1
9 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11996 0
10 GRB 001011 gB 18 23 04.6 -50 54 16           ~ 14 2
11 GRB 001109 gB 18 30 07.8 +55 17 56           ~ 38 0
12 GRB 010412 gB 19 23.6 +13 37           ~ 15 0
13 NAME Cyg Complex reg 20 32 +45.0           ~ 532 0
14 GRB 980519 gB 23 22 21.5 +77 15 43           ~ 195 0

    Equat.    Gal    SGal    Ecl

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