MAXI/GSC detected a possible hard-to-soft state transition in Cygnus X-1

Details MAXI/GSC detected a possible hard-to-soft state transition in Cygnus X-1 MAXI/GSC detected a possible hard-to-soft state transition in Cygnus X-1

Aug 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011atel.3534....1n&link_type=abstract

The Astronomer's Telegram, #3534

Astronomy and Astrophysics

Astronomy

2

X-Ray, Binary, Black Hole, Transient

Scientific paper

MAXI/GSC detected a possible hard-to-soft state transition of Cyg X-1, which had been in the hard state since the end of April, 2011 (Grinberg et al. ATel #3307). In the last about 10 days, Cyg X-1 showed large X-ray flares with amplitudes of about 1 Crab and with little spectral changes on timescales of days in the MAXI/GSC 2-20 keV light curves. (http://maxi.riken.jp/top/index.php?cid=000000000001&star_dir_id=00000000424) The variation was also seen in the Swift BAT 15-50 keV light curve.

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