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Periodicity in the TeV gamma rays and X rays from Markarian 501 · arXivDesk

astro-ph/9906087Jun 4, 19994 pages including 2 figures, to appear in proceeding of the 26th ICRC, Salt Lake City, August, 1999

Periodicity in the TeV gamma rays and X rays from Markarian 501

The Utah Seven Telescope Array collaboration

Abstract

Historical TeV gamma-ray flares from Markarian 501 was observed using Utah Seven Telescope Array (7TA) from the end of March to the end of July of 1997. The Rossi X-ray Timing Explorer All Sky Monitor (RXTE ASM) has been observing X rays from Mrk 501 since Jan. 5, 1996. We find evidence for periodicities of $23.9^{+2.3}_{-2.0}$ days and $23.9^{+1.6}_{-2.9}$

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