Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010atel.2549....1b&link_type=abstract
The Astronomer's Telegram, #2549
Astronomy and Astrophysics
Astronomy
3
Infra-Red, X-Ray, Binaries, Black Holes, Transients
Scientific paper
We have been monitoring the black-hole candidate (ATel #2269) XTE J1752-223 using the ANDICAM instrument on the SMARTS 1.3m telescope in Cerro Tololo, Chile (IR) , and the PCA instrument on the Rossi X-ray Timing Explorer (RXTE, X-ray). XTE J1752-223 has made a gradual transition to the hard state since the transition started around 2010 March 27 (ATel#2518). Since then, the power spectrum as measured by the RXTE has shown an increase in the fractional rms from 10% (ATel#2518) to 25%+/-1.2% on 2010 April 12 (ObsID 95360-01-12-02).
Buxton Michelle M.
Dincer Tolga
Kalemci Emrah
Tomsick John
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