X-ray flashes and X-ray rich Gamma Ray Bursts

Details X-ray flashes and X-ray rich Gamma Ray Bursts X-ray flashes and X-ray rich Gamma Ray Bursts

2001-11-13

arxiv.org/abs/astro-ph/0111246v1

AIP Conf.Proc. 662 (2003) 229-236

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures (2 in color), to appear in the proceedings of the October 2000 Rome Workshop on ``Gamma-Ray Bursts in the A

Scientific paper

10.1063/1.1579346

X-ray flashes are detected in the Wide Field Cameras on BeppoSAX in the energy range 2-25 keV as bright X-ray sources lasting of the order of minutes, but remaining undetected in the Gamma Ray Bursts Monitor on BeppoSAX. They have properties very similar to the x-ray counterparts of GRBs and account for some of the Fast X-ray Transient events seen in almost every x-ray satellite. We review their X-ray properties and show that x-ray flashes are in fact very soft, x-ray rich, untriggered gamma ray bursts, in which the peak energy in 2-10 keV x-rays could be up to a factor of 100 larger than the peak energy in the 50-300 keV gamma ray range. The frequency is ~100 per year.

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