Renewed X-ray activity in GX 339-4

Details Renewed X-ray activity in GX 339-4 Renewed X-ray activity in GX 339-4

Feb 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004atel..231....1s&link_type=abstract

The Astronomer's Telegram, #231

Statistics

12

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

Scientific paper

Recent monitoring of GX 339-4 in the 2-30 keV X-ray band by the Proportional Counter Array (PCA) of the Rossi X-ray Timing Explorer (RXTE) shows that the newly reported activity in the optical and radio (ATEL #230) is accompanied by faint X-ray emission. On February 1 at 04:00 UT, the X-ray count rate was 1 count/second/Proportional Counter Unit (PCU). On February 9 at 05:40 UT, the rate was about 6 times higher, yielding sufficient statistics for a spectral fit, which shows the source to be in the hard state (photon power law index 1.55).

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