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SLX 1746-331 In Outburst

ATel #1235; C. B. Markwardt (CRESST/NASA/GSFC), J. H. Swank (NASA/GSFC)
on 11 Oct 2007; 19:19 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Craig B. Markwardt (craigm@lheamail.gsfc.nasa.gov)

Subjects: X-ray, Request for Observations, Black Hole, Transient

Referred to by ATel #: 1237, 1252, 1385, 1633, 3098

Monitoring observations of the galactic center regions by the RXTE PCA reveal that the black hole candidate SLX 1746-331 has entered outburst again. The previous outburst was in 2003 (ATel #143).

The 2-10 keV flux has increased from about 8 mCrab to 120 mCrab from Oct. 6.36 to Oct 10.41. The previous 95% upper limits had been about 2 mCrab.

RXTE performed pointed observations on Oct 9.17 and Oct 10.72. In the later observation, the spectrum was quite soft (consistent with a black body plus steep power law model). The fluxes in the 2-10, 10-20 and 20-40 keV bands were 390, 8 and 1, in units of 10^{-11} erg/cm^2/s. No significant variability was detected.