Computer Science – Databases
Scientific paper
Oct 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aipc.1279..436t&link_type=abstract
DECIPHERING THE ANCIENT UNIVERSE WITH GAMMA-RAY BURSTS. AIP Conference Proceedings, Volume 1279, pp. 436-438 (2010).
Computer Science
Databases
Gamma-Ray Sources (Astronomical), Sky Surveys, X-Ray Detection, Gamma-Ray Sources, Gamma-Ray Bursts, Astronomical Catalogs, Atlases, Sky Surveys, Databases, Retrieval Systems, Archives, Etc., Astronomical And Space-Research Instrumentation
Scientific paper
A study of spectral evolutions of gamma-ray burst (GRB) prompt emissions observed with Suzaku Wide-band All-sky Monitor (WAM) is presented. Thank to the large effective areas, Suzaku-WAM is one of the best instruments to investigate spectral evolutions of the GRB prompt emissions. In general the rise and decay time scales in the light curves are determined by the heating and cooling time scale and geometrical effect of the emission regions. It has been argued that the expected highly relativistic emission regions and its deceleration would produce spectral evolution could cause apparent spectral evolution in the observer frame. However, it is not easy to attribute exponential decays with spectral evolutions to the relativistic effect of the GRB jet. In other words, electron cooling is the key to solve the spectral variations in the exponential decays. This paper focuses the isolated fast-rise-exponential-decay (FRED) type light curve observed with WAM and their spectral evolutions, and revealed an energy dependence of the time constant of the observed exponential decay. The ``energy indices'' observed from some of the GRBs are consistent with those expected in synchrotron or inverse Compton cooling.
Onda Kaori
Tashiro Makoto S.
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