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'''GRB 970228'''<ref name="nomenclature">"GRB" indicates that the event was a gamma-ray burst, and the numbers follow a YYMMDD format corresponding to the date on which the burst occurred: February 28, 1997</ref> was28 aŞubat 1997 günü saat 02:58'de ([[gamma-ray burstUTC]] (GRB) detectedtespit onedilmiş February 28, 1997 at 02:58bir [[UTCgama-ışın patlaması]]dır. A gamma-ray burst is a highly [[luminosity|luminous]] flash of [[gamma ray]]s, the most energetic form of [[electromagnetic radiation]]. Since 1993, physicists had predicted these bursts to be followed by a longer-lived [[Afterglow (gamma-ray burst)|afterglow]] at longer wavelengths, such as [[radio waves]], [[x-rays]], and even [[visible light]]. Until this event, GRBs had only been observed at gamma wavelengths. This was the first burst for which an afterglow was observed.<ref>[[#Schilling|Schilling 2002]], p. 101</ref>
 
'''GRB 970228'''<ref name="nomenclature">"GRB" indicates that the event was a gamma-ray burst, and the numbers follow a YYMMDD format corresponding to the date on which the burst occurred: February 28, 1997</ref> was a [[gamma-ray burst]] (GRB) detected on February 28, 1997 at 02:58 [[UTC]]. A gamma-ray burst is a highly [[luminosity|luminous]] flash of [[gamma ray]]s, the most energetic form of [[electromagnetic radiation]]. Since 1993, physicists had predicted these bursts to be followed by a longer-lived [[Afterglow (gamma-ray burst)|afterglow]] at longer wavelengths, such as [[radio waves]], [[x-rays]], and even [[visible light]]. Until this event, GRBs had only been observed at gamma wavelengths. This was the first burst for which an afterglow was observed.<ref>[[#Schilling|Schilling 2002]], p. 101</ref>
 
The burst had multiple peaks in its [[light curve]] and lasted approximately 80&nbsp;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 at a [[redshift]] of z&nbsp;=&nbsp;0.695, providing early evidence that GRBs occur well beyond the [[Milky Way]].
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