Sofia Feltzing
Professor of astronomy
GRB 030227 : The first multiwavelength afterglow of an INTEGRAL GRB
Author
Summary, in English
We present multiwavelength observations of a gamma-ray burst detected byINTEGRAL (GRB 030227) between 5.3 hours and ~ 1.7days after the event. Here we report the discovery of a dim opticalafterglow (OA) that would not have been detected by many previoussearches due to its faintess (R ~ 23). This OA was seen to declinefollowing a power law decay with index alpha R = -0.95 +/-0.16. The spectral index beta_ opt/NIR yielded -1.25 +/- 0.14. Thesevalues may be explained by a relativistic expansion of a fireball (withp = 2.0) in the cooling regime. We also find evidence for inverseCompton scattering in X-rays.Based on observations with INTEGRAL, an ESA project with instruments andscience data centre funded by ESA member states (especially the PIcountries: Denmark, France, Germany, Italy, Switzerland, Spain), CzechRepublic and Poland, and with the participation of Russia and the USA.Also partially based on observations collected by the Gamma-Ray BurstCollaboration at ESO (GRACE) at the European Southern Observatory, Chile(ESO Large Programme 165.H-0464).
Department/s
- Lund Observatory - Has been reorganised
Publishing year
2003
Language
English
Pages
315-319
Publication/Series
Astronomy & Astrophysics
Volume
411
Issue
1
Full text
- Available as PDF - 298 kB
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Document type
Journal article
Publisher
EDP Sciences
Topic
- Astronomy, Astrophysics and Cosmology
Keywords
- gamma rays: bursts
- techniques: photometric
- cosmology: observations
Status
Published
ISBN/ISSN/Other
- ISSN: 0004-6361