GRB 030227 : The first multiwavelength afterglow of an INTEGRAL GRB

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Abstract

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).

Detaljer

Författare
  • A. J. Castro-Tirado
  • J. Gorosabel
  • S. Guziy
  • D. Reverte
  • J. M. Castro Cerón
  • A. de Ugarte Postigo
  • N. Tanvir
  • S. Mereghetti
  • A. Tiengo
  • J. Buckle
  • R. Sagar
  • S. B. Pandey
  • V. Mohan
  • N. Masetti
  • F. Mannucci
  • Ingemar Lundström
  • H. Pedersen
  • C. Riess
  • S. Trushkin
  • J. Vílchez
  • N. Lund
  • S. Brandt
  • S. Martínez Núñez
  • V. Reglero
  • M. D. Pérez-Ramírez
  • S. Klose
  • J. Greiner
  • J. Hjorth
  • L. Kaper
  • E. Pian
  • E. Palazzi
  • M. I. Andersen
  • A. Fruchter
  • J. P. U. Fynbo
  • B. L. Jensen
  • C. Kouveliotou
  • J. Rhoads
  • E. Rol
  • P. M. Vreeswijk
  • R. A. M. J. Wijers
  • E. van den Heuvel
Enheter & grupper
Forskningsområden

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Astronomi, astrofysik och kosmologi

Nyckelord

Originalspråkengelska
Sidor (från-till)L315-L319
TidskriftAstronomy & Astrophysics
Volym411
Utgåva nummer1
StatusPublished - 2003
PublikationskategoriForskning
Peer review utfördJa

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