Confirmation of the Transition to the Very High State in GX 339-4

Details Confirmation of the Transition to the Very High State in GX 339-4 Confirmation of the Transition to the Very High State in GX 339-4

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..322....1s&link_type=abstract

The Astronomer's Telegram, #322

Astronomy and Astrophysics

Astronomy

3

X-Ray, Request For Observations, Binaries, Black Holes, Transients

Scientific paper

Homan (2004, ATEL #318) recently predicted that black-hole candidate GX 339-4 would make a transition to the Very High State around August 14, and we find, also using data from the Rossi X-ray Timing Explorer, that this transition has occurred. The photon spectral index had averaged around 1.50 for the past month in the hard state; the recent evolution has been: 1.54 at 6h on 5 August, 1.58 at 10h on 8 August, 1.81 at 0h on 12 August, 2.39 at 23h on 13 August, and 2.83 at 14h on 17 August.

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