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GCRT J1745-3009
GCRT J1745-3009 is a transient, bursting low-frequency radio source which lies in the direction of the galactic center.
==Discovery==
A group of astronomers from Sweet Briar College and the Naval Research Laboratory detected transient emission from two sources in 1998 while studying the Galactic Center. They then began monitoring the region specifically looking for transient sources and detected five bursts of radio waves about 1 meter in wavelength (frequency 330 MHz) during a seven-hour period from September 30 to October 1, 2002.
The five bursts were of equal brightness, with each lasting about 10 minutes, and occurring every 77 minutes.〔 (Text at ''Nature''. )〕 Like an earlier low-frequency transient discovered by the same group,〔Low-Frequency Radio Transients in the Galactic Center, Scott D. Hyman, T. Joseph W. Lazio, Namier E. Kassim, and Ashlee L. Bartleson, ''Astronomical Journal'' 123, #3 (March 2002), pp. 1497–1501. (Paper at ADSABS )〕 it was given the designation ''GCRT'', an abbreviation for ''Galactic Center Radio Transient''. The source was also nicknamed a ''burper''.〔 (Text at ''Nature''. )〕 The group found no X-ray or γ-ray counterpart to the object.〔
Another burst from the source was later found in data recorded September 28, 2003,〔A New Radio Detection of the Transient Bursting Source GCRT J1745-3009, Scott D. Hyman, T. Joseph W. Lazio, Subhashis Roy, Paul S. Ray, Namir E. Kassim, and Jennifer L. Neureuther, ''Astrophysical Journal'' 639, #1 (March 2006), pp. 348–353. (Paper at ADSABS ); also (arXiv:astro-ph/0508264 ).〕 and a weaker burst was found in data recorded March 20, 2004.〔 As of January 2007, no other bursts have been found.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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