Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007asthe.100..452y&link_type=abstract
The Astronomical Herald (ISSN 0374-2466), Vol. 100, No. 9, p. 452 - 461 (2007)
Astronomy and Astrophysics
Astronomy
X-Rays, Stellar Winds
Scientific paper
Presented are the initial results of Suzaku wide-band all-sky monitor (WAM) based on its 1.5 year operation. The WAM is the secondary function of large, thick lateral shield of the Hard X-ray Detector (HXD), which has a large effective area with 400 cm2 at 1 MeV and a wide field of view of about 2 pi str. The WAM has already detected more than 234 gamma-ray bursts and 152 solar flares. Thus, it has established the firm position as the fourth instrument on board Suzaku. It is also cross-calibrated with Swift/BAT and Wind/Konus instruments using bright GRBs, and the WAM energy response can be used for spectral analysis within 20-30% accuracy. The WAM observations of the four short-duration GRBs simultaneously detected with Wind/Konus are introduced finally. The spectral shape and no lag behaviour are similar to that in the previously known short GRBs, but the estimated isotropic energy and energy peak of the four short GRBs is out of the Amati relation, suggesting that the origin of short GRBs is different from that of the long GRBs.
Ohno Masanori
Tashiro Makoto
Yamaoka Kazutaka
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