6533b851fe1ef96bd12a8d83

RESEARCH PRODUCT

GRB 030227: The first multiwavelength afterglow of an INTEGRAL GRB

Sylvio KloseSandro MereghettiSofia FeltzingVictor RegleroA. J. Castro-tiradoHenrik D. PedersenJ. M. Castro CerónE.p.j. Van Den HeuvelM. D. Perez-ramirezChryssa KouveliotouS. BrandtA. S. FruchterNial R. TanvirJosé M. VílchezA. De Ugarte PostigoShashi B. PandeyMichael I. AndersenJames E. RhoadsVijay MohanFilippo MannucciRalph A. M. J. WijersB. L. JensenNiels LundJens HjorthSergei GuziyLex KaperRam SagarJ. P. U. FynboIngemar LundströmC. RiessJavier GorosabelJavier GorosabelN. MasettiD. ReverteS. A. TrushkinAndrea TiengoElena PianJ. BuckleEvert RolPaul VreeswijkS. Martínez NúñezJochen GreinerEliana Palazzi

subject

PhysicsSpectral indexBurstsAstrophysics (astro-ph)Gamma raysCompton scatteringbursts [gamma rays]FOS: Physical sciencesAstronomy and AstrophysicsAstrophysicsGamma rays ; Bursts ; Photometric ; Cosmology observationsPhotometricUNESCO::ASTRONOMÍA Y ASTROFÍSICAAstrophysicsCosmology observationsPower law:ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogonia [UNESCO]observations [cosmology]Afterglowphotometric [techniques]Space and Planetary ScienceAstronomy Astrophysics and CosmologyUNESCO::ASTRONOMÍA Y ASTROFÍSICA::Cosmología y cosmogoniaGamma-ray burst:ASTRONOMÍA Y ASTROFÍSICA [UNESCO]

description

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 +/- 0.16. The spectral index Beta_opt/NIR yielded -1.25 +/- 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.

yearjournalcountryeditionlanguage
2003-01-01
http://hdl.handle.net/10550/14020