Swift/BAT flux indicates Cyg X-3 enters a new gamma-ray active period

Details Swift/BAT flux indicates Cyg X-3 enters a new gamma-ray active period Swift/BAT flux indicates Cyg X-3 enters a new gamma-ray active period

Jun 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3439....1y&link_type=abstract

The Astronomer's Telegram, #3439

Astronomy and Astrophysics

Astronomy

Request For Observations, Binary

Scientific paper

Gamma-ray flares (> 100 MeV) have been seen in Cyg X-3 whenever it transits to a low hard X-ray flux level (e.g., Tavani et al. 2009, Abdo et al. 2009). Our study of the correlated X-ray and gamma-ray activities with the RXTE/ASM, the Swift/BAT and the Fermi/LAT observations of Cyg X-3 yields an empirical relation between the BAT minimum flux reached and the peak flux of the gamma-ray flare, which suggests that Cyg X-3 should enter gamma-ray active periods whenever the 5-day averaged 15-50 keV flux goes below 0.12 crab (Yu & Xing, submitted to ApJ).

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