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Unusually High Metallicity Host Of The Dark LGRB 051022
J. F. Graham, A. S. Fruchter, L. J. Kewley +5
We present spectroscopy of the host of GRB 051022 with GMOS nod and shuffle on Gemini South and NIRSPEC on Keck II. We determine a metallicity for the host of log(O/H)+12 = 8.77 us…
Rise and fall of the X-ray flash 080330: an off-axis jet?
C. Guidorzi, C. Clemens, S. Kobayashi +31
X-ray flashes (XRFs) are a class of gamma-ray bursts (GRBs) with the peak energy of the time-integrated spectrum, Ep, below 30 keV, whereas classical GRBs have Ep of a few hundreds…
Evidence for energy injection and a fine-tuned central engine at optical wavelengths in GRB 070419A
A. Melandri, C. Guidorzi, S. Kobayashi +13
We present a comprehensive multiwavelength temporal and spectral analysis of the FRED GRB 070419A. The early-time emission in the -ray and X-ray bands can be explained by a cent…
The unusual X-ray light-curve of GRB 080307: the onset of the afterglow?
K. L. Page, R. Willingale, P. T. O'Brien +11
Swift-detected GRB 080307 showed an unusual smooth rise in its X-ray light-curve around 100 seconds after the burst, at the start of which the emission briefly softened. This `hump…