Other
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1065..255d&link_type=abstract
2008 NANJING GAMMA-RAY BURST CONFERENCE. AIP Conference Proceedings, Volume 1065, pp. 255-258 (2008).
Other
Gamma-Ray Sources, Gamma-Ray Bursts, Neutrino, Muon, Pion, And Other Elementary Particle Detectors, Cosmic Ray Detectors, Interstellar Medium And Nebulae In External Galaxies
Scientific paper
GRB080319B reached 5th optical mag during the burst. Thanks to the VLT/UVES rapid response mode, we observed its afterglow just 8m:30s after the GRB onset when R was ~12. This allowed us to obtain the best signal-to-noise, high resolution spectrum of a GRB afterglow ever (S/N ~50). The spectrum is rich of absorption features belonging to the main system at z = 0.937, divided in at least six components spanning a velocity range of 120 km/s. The observations caught the absorbing gas in a highly excited state, producing the strongest FeII fine structure lines ever observed in a GRB. A few hours later the optical depth of these lines was reduced by a factor of 4-20, and the optical/UV flux by a factor of ~60. This proves that the excitation of the observed fine structure lines is due to ``pumping'' by the GRB UV photons. A comparison of the observed ratio between the number of photons absorbed by the excited and ground state of the FeII suggests that the six absorbers are ~18-34 kpc from the GRB site, with component I ~2 times closer to the GRB site than components III to VI. This suggests a structured ISM in this galaxy complex.
D'Elia Valerio
Fiore Fabrizio
Krongold Yair
Nicastro Fabrizio
Perna Rosalba
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