316 citations · 564 across the 2 of their papers we have counts for
5 papers · 1 filter
Afterglow spectrum of a gamma-ray burst with the highest known redshift z=6.295
N. Kawai, G. Kosugi, K. Aoki +25
Gamma-ray bursts (GRBs) and their afterglows have been proposed as an excellent probe to study the evolution of cosmic star formation, the reionization of the intergalactic medium,…
Multi-wavelength analysis of the field of the dark burst GRB 031220
A. Melandri, B. Gendre, L. A. Antonelli +8
We have collected and analyzed data taken in different spectral bands (from X-ray to optical and infrared) of the field of GRB031220 and we present results of such multiband observ…
The afterglow of GRB050709 and the nature of the short-hard gamma-ray bursts
D. B. Fox, D. A. Frail, P. A. Price +33
The final chapter in the long-standing mystery of the gamma-ray bursts (GRBs) centres on the origin of the short-hard class, suspected on theoretical grounds to result from the coa…
A Variable Infrared Counterpart to the Soft Gamma-ray Repeater SGR 1806-20
George Kosugi, Ryusuke Ogasawara, Hiroshi Terada
We present K'-band (2.12 micron) imaging observations of the SGR 1806-20 field taken during its very active phase in mid 2004, which reveal brightening of sources within the Chandr…
A Discovery of Rapid Optical Flares from Low-Luminosity Active Nuclei in Massive Galaxies
Tomonori Totani, Takahiro Sumi, George Kosugi +3
We report a serendipitous discovery of six very low-luminosity active galactic nuclei (AGNs) only by optical variability in one-month baseline. The detected flux variability is ~ 1…