Swift panchromatic observations of the bright gamma-ray burst GRB 050525a


Blustin A., Band D., Barthelmy S., Boyd P., Capalbi M., Holland S., ...Daha Fazla

ASTROPHYSICAL JOURNAL, cilt.637, sa.2, ss.901-913, 2006 (SCI-Expanded) identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 637 Sayı: 2
  • Basım Tarihi: 2006
  • Doi Numarası: 10.1086/498425
  • Dergi Adı: ASTROPHYSICAL JOURNAL
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.901-913
  • Anahtar Kelimeler: astrometry, galaxies : distances and redshifts, gamma rays : bursts, shock waves, X-rays : individual (GRB 050525a), LIGHT CURVES, PEAK LUMINOSITY, OPTICAL FLASH, AFTERGLOW, ENERGY, SPECTRA, GRB-990123, ENERGETICS, EVOLUTION, RADIATION
  • İstanbul Üniversitesi Adresli: Hayır

Özet

The bright gamma- ray burst GRB 050525a has been detected with the Swift observatory, providing unique multiwavelength coverage from the very earliest phases of the burst. The X- ray and optical / UV afterglow decay light curves both exhibit a steeper slope similar to 0.15 days after the burst, indicative of a jet break. This jet break time combined with the total gamma- ray energy of the burst constrains the opening angle of the jet to be 3 degrees.2. We derive an empirical `` timelag'' redshift from the BAT data of (z) over bar z 0: 69 +/- 0: 02, in good agreement with the spectroscopic redshift of 0.61. Prior to the jet break, the X- ray data can be modeled by a simple power law with index alpha = - 1: 2. However, after 300 s the X- ray flux brightens by about 30% compared to the power- law fit. The optical / UV data have a more complex decay, with evidence of a rapidly falling reverse shock component that dominates in the first minute or so, giving way to a flatter forward shock component at later times. The multiwavelength X- ray/ UV/ optical spectrum of the afterglow shows evidence for migration of the electron cooling frequency through the optical range within 25,000 s. The measured temporal decay and spectral indexes in the X- ray and optical/ UV regimes compare favorably with the standard fireball model for gamma- ray bursts assuming expansion into a constant- density interstellar medium.