EDP Sciences Journals List
Advanced Search
Subscriber Authentication Point
Home All issues Volume 417/3 Article
Free access article

Issue A&A
Volume 417, Number 3, April III 2004
Page(s) L45 - L48
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20040080



A&A 417, L45-L48 (2004)
DOI: 10.1051/0004-6361:20040080

Letter

Spectral evolution of weak bursts from SGR 1806-20 observed with INTEGRAL

D. Götz1, 2, S. Mereghetti1, I. F. Mirabel3, 4 and K. Hurley5

1  Istituto di Astrofisica Spaziale e Fisica Cosmica - CNR, Sezione di Milano "G. Occhialini", via Bassini 15, 20133 Milano, Italy
2  Dipartimento di Fisica, Università degli Studi di Milano Bicocca, P.zza della Scienza 3, 20126 Milano, Italy
3  Service d'Astrophysique, CEA/Saclay, Orme des Merisiers, Bât. 709, 91191 Gif-sur-Yvette, France
4  Instituto de Astronomia y Fisica del Espacio / CONICET, cc67, suc 28, 1428 Buenos Aires, Argentina
5  UC Berkeley Space Sciences Laboratory, Berkeley CA 94720-7450, USA

(Received 28 January 2004 / Accepted 29 February 2004)

Abstract
We report on bursts from the Soft Gamma-Ray Repeater SGR 1806-20 detected with INTEGRAL in October 2003, during a period of moderate activity of the source. The spectral and temporal properties of 21 short bursts are consistent with those found in previous observations, even if these bursts are among the faintest observed in the 15-200 keV range from this source. During some of the bursts a clear spectral evolution is visible. The data also show, for the first time, evidence for a hardness-intensity anti-correlation within SGR 1806-20 bursts.


Key words: gamma rays: bursts -- gamma rays: observations -- pulsars: general -- stars: individual: SGR 1806-20

Offprint request: D. Götz, diego@mi.iasf.cnr.it

SIMBAD Objects



© ESO 2004


What is OpenURL?

The OpenURL standard is a protocol for transmission of metadata describing the resource that you wish to access. An OpenURL link contains article metadata and directs it to the OpenURL server of your choice. The OpenURL server can provide access to the resource and also offer complementary services (specific search engine, export of references...). The OpenURL link can be generated by different means.
  • If your librarian has set up your subscription with an OpenURL resolver, OpenURL links appear automatically on the abstract pages.
  • You can define your own OpenURL resolver with your EDPS Account. In this case your choice will be given priority over that of your library.
  • You can use an add-on for your browser (Firefox or I.E.) to display OpenURL links on a page (see http://www.openly.com/openurlref/). You should disable this module if you wish to use the OpenURL server that you or your library have defined.