Title of article
INTEGRAL results on GRB 030320: A long gamma-ray burst detected at the edge of the field of view
Author/Authors
Covino، S. نويسنده , , Malesani، D. نويسنده , , Gotz، D. نويسنده , , Mereghetti، S. نويسنده , , Rau، A. نويسنده , , Molinari، E. نويسنده , , Zerbi، F. M. نويسنده , , Beckmann، V. نويسنده , , Lichti، G. G. نويسنده , , Kienlin، A. von نويسنده , , Sturner، S. J. نويسنده , , Shrader، C. R. نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
-320
From page
321
To page
0
Abstract
We present multiwavelength observations of a gamma-ray burst detected by INTEGRAL (GRB 030227) between 5.3 hours and ~1.7 days after the event. Here we report the discovery of a dim optical afterglow (OA) that would not have been detected by many previous searches due to its faintess (R~ 23). This OA was seen to decline following a power law decay with index (alpha)(R)=-0.95 (plus-minus) 0.16. The spectral index (beta)opt/NIR yielded 1.25 (plus-minus) 0.14.These values may be explained by a relativistic expansion of a fireball (with p = 2.0) in the cooling regime. We also find evidence for inverse Compton scattering in X-rays.
Keywords
GRB , gamma-ray bursts , SPI , IBIS , INTEGRAL , gamma-ray astronomy
Journal title
Astronomy and Astrophysics
Serial Year
2003
Journal title
Astronomy and Astrophysics
Record number
78043
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