Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1279..469y&link_type=abstract
DECIPHERING THE ANCIENT UNIVERSE WITH GAMMA-RAY BURSTS. AIP Conference Proceedings, Volume 1279, pp. 469-471 (2010).
Astronomy and Astrophysics
Astrophysics
Gamma-Ray Sources (Astronomical), Redshift, Photometry, Astronomical Observatories, X-Rays, Gamma-Ray Sources, Gamma-Ray Bursts, Distances, Redshifts, Radial Velocities, Spatial Distribution Of Galaxies, Photometric, Polarimetric, And Spectroscopic Instrumentation, Observatories And Site Testing, X-Ray Sources, X-Ray Bursts
Scientific paper
We observed the near-infrared (NIR) afterglow of the high-redshift (z = 8.2) gamma-ray burst (GRB) GRB 090423 with the 188 cm telescope of Okayama Astrophysical Observatory. We clearly detected the afterglow in J band, and marginally detected in the H band. The J band AB magnitude of the afterglow was 20.16+/-0.14 at about 104 seconds after the burst. Together with previously reported NIR results, we found that the NIR flux of the afterglow remained almost constant between 103 s to 104 s after the burst, and the break time of the light curve in the NIR band (Tb, NIR) was substantially delayed from that in the X-ray band (Tb,X). The time delay Δt = Tb,NIR-Tb,X~5,000 s-17,000 s.
Kawai Nobuyuki
Kuroda Daisuke
Ohta Kazutoshi
Yanagisawa Kenshi
Yoshida Makiko
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