Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009atel.1975....1d&link_type=abstract
The Astronomer's Telegram, #1975
Astronomy and Astrophysics
Astronomy
1
X-Ray, Binaries, Neutron Stars, Transients
Scientific paper
On 2009 March 13th Swift/XRT observed the field of the Very Faint X-ray Transient (VFXT) SAX J1753.5-2349. In the ~2.2 ks (net exposure) photon counting mode observation, no sources are detected in the XRT error box for SAX J1753.5-2349. A 3-sigma upper limit can be measured at about 6E-3 counts/s. Adopting a spectral model with Nh=2.1E22 cm-2 and a photon index of 2.2, we obtain an unabsorbed flux as 6.0E-14 erg cm-2 s-1 (2-10 keV), corresponding to a luminosity level of about 5E32 erg s-1 (at 8 kpc).
Del Santo Melania
Romano Patrizia
Sidoli Lara
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