SWIFT and RXTE observations of Cir X-1 in an extended low-flux state

Details SWIFT and RXTE observations of Cir X-1 in an extended low-flux state SWIFT and RXTE observations of Cir X-1 in an extended low-flux state

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atel..811....1j&link_type=abstract

The Astronomer's Telegram, #811

Astronomy and Astrophysics

Astronomy

1

X-Ray, Request For Observations, Binaries, Neutron Stars

Scientific paper

We report on our analysis of RXTE and two SWIFT observations of Cir X-1. RXTE/ASM observations show that Cir X-1 has been at or below the ASM detection level as of April 26 (MJD 53851.630). Hence the source has been undetected for more than 1 binary orbital period. An RXTE/PCA observation has been obtained on May 9 at 11:58 UTC 2005. A fit to the PCA X-ray spectrum gives an 0.5-10 keV flux of 2E-10 erg cm^-2 s^-1 (line emission is seen at 6.5 keV as well, although this could be related to the Galactic Ridge emission which contributes about 25% to the PCA flux).

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