Issue |
A&A
Volume 409, Number 3, October III 2003
|
|
---|---|---|
Page(s) | 983 - 987 | |
Section | Stellar structure and evolution | |
DOI | https://doi.org/10.1051/0004-6361:20031127 | |
Published online | 17 November 2003 |
The X-ray afterglow of GRB 030329
1
Istituto di Astrofisica Spaziale e Fisica Cosmica – CNR, Sezione di Milano “G.Occhialini”, Via Bassini 15, 20133 Milano, Italy
2
Università degli Studi di Milano, Dipartimento di Fisica, v. Celoria 16, 20133 Milano, Italy
3
INAF-Osservatorio Astronomico di Brera, v. Bianchi 46, 23907 Merate (LC), Italy
4
Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK
5
XMM-Newton Science Operation Center, ESA, Vilspa, Apartado 50727, 28080 Madrid, Spain
Corresponding author: A. Tiengo, tiengo@mi.iasf.cnr.it
Received:
30
May
2003
Accepted:
23
July
2003
We report on XMM-Newton and Rossi-XTE observations of the bright (fluence ~10-4 erg cm-2) and nearby () Gamma-Ray Burst GRB 030329 associated to SN2003dh.
The first Rossi-XTE observation, 5 hours after the burst, shows a flux
decreasing with time as a power law with index
.
Such a decay law is only marginally consistent with a further Rossi-XTE measurement
(at
hr).
Late time observations of this bright afterglow at X-ray wavelengths have the
advantage, compared to optical observations, of not
being affected by contributions from the supernova and host galaxy.
A first XMM-Newton observation, at
days, shows a flux
of
erg cm-2 s-1 (0.2–10 keV). The spectrum is a power law
with photon index
and absorption <
cm-2,
consistent with the Galactic value. A further XMM-Newton pointing at
days shows a flux fainter by a factor ~2.
The combined Rossi-XTE and XMM-Newton measurements require a break at
days in the
afterglow decay, with a power law index increasing from 0.9 to 1.9, similar to
what is observed in the early part of the optical afterglow.
The extrapolation of the XMM-Newton spectra to optical frequencies lies a
factor of ~10 below simultaneous measurements. This is likely due to
the presence of SN2003dh.
Key words: gamma rays: bursts
© ESO, 2003
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.