Volume 411, Number 1, November III 2003
Special letters issue on: first science with integral
|Page(s)||L315 - L319|
|Published online||17 November 2003|
Letter to the Editor
GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB *
Instituto de Astrofísica de Andalucía (IAA-CSIC), Apartado de Correos, 3004, 18080 Granada, Spain
2 Space Telescope Science Institute, 3700 San Martín Drive, Baltimore MD 21218, USA
3 Department of Physical Sciences, University of Hertfordshire, College Lane, Hatfield, Herts AL10 9AB, UK
4 Istituto di Astrofisica Spaziale e Fisica Cosmica, Sez. di Milano “G. Occhialini” – CNR v. Bassini 15, 20133 Milano, Italy
5 Joint Astronomy Centre, 660 N, A' ohoku Place, Hilo, HI 96720, USA
6 State Observatory, Manora Peak, Naini Tal 263129, Uttaranchal, India
7 Istituto di Astrofisica Spaziale e Fisica Cosmica – Sezione di Bologna, via Gobetti 101, 40129 Bologna, Italy
8 Istituto di Radioastronomia, sezione di Firenze, CNR, Largo E. Fermi 5, 50125, Firenze, Italy
9 Lund Observatory, Sölvegatan 27, PO Box 43, 221 00 Lund, Sweden
10 Astronomical Observatory, University of Copenhagen, Juliane Maries Vej 30, 2100 Copenhagen Ø , Denmark
11 University Observatory Munich, Scheinerstr. 1, 81679 Munich, Germany
12 Special Astrophysical Observatory of RAS, Karachai-Cherkessia, 369167, Nizhnij Arkhyz, Russia
13 Danish Space Research Institute, Juliane Maries Vej 30, 2100 Copenhagen Ø , Denmark.
14 Grupo de Astrofísica y Ciencias del Espacio, Universidad de Valencia, Apdo. 2085, 46071 Burjassot (Valencia), Spain
15 European Space Agency, Research Science Division, Noorwijk, The Netherlands
16 Thüringer Landessternwarte Tautenburg, 07778 Tautenburg, Germany
17 Max Planck Institut für extraterrestrische Physik, Giessenbachstr., PF 1312, 85741 Garching, Germany
18 University of Amsterdam, Kruislaan 403, 1098 SJ Amsterdam, The Netherlands
19 Osservatorio Astronomico di Trieste, via Tiepolo 11, 34131 Trieste, Italy
20 Astrophysikalisches Institut, An der Sternwarte 16, 14482 Potsdam, Germany
21 Department of Physics and Astronomy, Aarhus University, Ny Munkegade, 8000 Aarhus C, Denmark
22 NASA/MSFC, NSSTC, SD-50, 320 Sparkman Drive, Huntsville, AL 35805, USA
23 European Southern Observatory, Alonso de Córdova 3107, Casilla 19001, Santiago 19, Chile
Corresponding author: A. J. Castro-Tirado, firstname.lastname@example.org
Accepted: 10 September 2003
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 (). This OA was seen to decline following a power law decay with index . The spectral index yielded . 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.
Key words: gamma rays: bursts / techniques: photometric / cosmology: observations
Based on observations with INTEGRAL, an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain), Czech Republic and Poland, and with the participation of Russia and the USA. Also partially based on observations collected by the Gamma-Ray Burst Collaboration at ESO (GRACE) at the European Southern Observatory, Chile (ESO Large Programme 165.H-0464).
© ESO, 2003
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