Mr007 Mon 28 Feb 2011, 2:05 pmGRB 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
From Wikipedia, the free encyclopedia
Jump to: navigation, search
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
