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    Mr007
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    Posts : 42
    Join date : 2010-09-26

    From Wikipedia, the free encyclopedia

    Post  Mr007 on Mon 28 Feb 2011, 2:05 pm

    GRB 970228
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    GRB 970228
    A black background covered with orange stuff, with a bright orange spot in the upper-left corner and a dimmer orange spot in the center.
    GRB 970228 as seen by Hubble
    Detection
    Detection time 28 February 1997
    02:58 UTC
    Detected by BeppoSAX
    Duration 80 seconds
    Position
    Right ascension 05h 01m 46.7s
    Declination +11° 46′ 53.0″[1]
    Epoch J2000
    Redshift 0.695[2] (host galaxy)
    Distance 8.123×109 light-years[3]
    Constellation Orion
    Energetics
    Total energy output 5.2×1044
    J
    See also: Gamma-ray burst, Category:Gamma-ray bursts

    GRB 970228[4] was the first gamma-ray burst (GRB) for which an afterglow was observed.[5] It was detected on 28 February 1997 at 02:58 UTC. Since 1993, physicists had predicted GRBs to be followed by a lower-energy afterglow (in wavelengths such as radio waves, x-rays, and even visible light), but until this event, GRBs had only been observed in highly luminous bursts of high-energy gamma rays (the most energetic form of electromagnetic radiation).

    The burst had multiple peaks in its light curve and lasted approximately 80 seconds. Peculiarities in the light curve of GRB 970228 suggested that a supernova may have occurred as well. The position of the burst coincided with a galaxy about 8.1 billion light-years[3] away (a redshift of z = 0.695), providing early evidence that GRBs occur well beyond the Milky Way.
    equity release
    billeje

      Current date/time is Sun 04 Dec 2016, 2:47 am