منابع مشابه
Will GRB 990123 Perform an Encore ?
The recent gamma ray burst, GRB 990123, has an absorption redshift zs = 1.60, implying an apparent energy E ≥ 3×10 erg, and a peak luminosity Lmax ≥ 6×10 53 erg s, assuming isotropic emission. This energy is ten times larger than hitherto measured and in excess of the rest mass of the sun. Optical observations have revealed an associated galaxy displaced from the line of sight by ∼ 0.6. This ra...
متن کاملphotometry of GRB 980703 and GRB 990123 host galaxies
We present a photometry of GRB 980703 and GRB 990123 host galaxies which was performed after about 20 days and a half year after gamma-bursts occur, respectively. This fact allows us to consider that we observed host galaxies light only. The contributions of the optical transiets (OT) were negligible in both cases. We derived the broad band BV RcIc spectra of the host galaxies and compared them...
متن کاملGRB 990123 a unique optical flash ?
GRB 990123 was a long, complex gamma-ray burst accompanied by an extremely bright optical flash. We find different constraints on the bulk Lorentz of this burst to be consistent with the speculation that the optical light is emission from the reverse shock component of the external shock. Motivated by this currently favoured idea, we compute the prompt reverse shock emission to be expected for ...
متن کاملphotometry of the GRB 980703 and GRB 990123 host galaxies
We present a photometry of GRB 980703 and GRB 990123 host galaxies which was performed about 20 days and a half year after gamma-ray bursts occured, respectively. The contributions of the optical transiets (OT) were negligible in both cases. We derived broad band BV RcIc spectra of the host galaxies and compared them to continuum spectra of different Hubble-type galaxies and averaged spectra of...
متن کاملStar - forming regions near GRB 990123 ?
We reduced the Hubble Space Telescope Space Telescope Imaging Spectrograph images of the gamma-ray burst GRB 990123 that were obtained on 8–9 February 1999 and find V0 = 25.36 ± 0.10, which corresponds to a flux of 0.258±0.023μJy for the optical transient 16.644 days after the burst’s peak. The probable host galaxy has V0 = 24.25 ± 0.07 (0.716 ± 0.046μJy) and the optical transient is located 0....
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 1999
ISSN: 0035-8711,1365-2966
DOI: 10.1046/j.1365-8711.1999.02530.x