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X-ray Detection of the Supersoft Source Phase of Nova Vul 2007

ATel #1246; J. J. Drake (Smithsonian Astrophysical Observatory), K. Page, J. Osborne (Leicester), M. Bode (Liverpool John Moores), R. Corradi, P. Rodriguez-Gil (Instituto de Astrofisica de Canarias), J. Drew (Hertfordshire), B. Gaensicke, Daniel Steeghs (Warwick), C. Knigge (Southampton), J. Sokoloski (Columbia)
on 19 Oct 2007; 20:37 UT
Credential Certification: Jeremy J. Drake (jdrake@cfa.harvard.edu)

Subjects: X-ray, Nova

Referred to by ATel #: 1631, 1721, 2670

We report the X-ray detection of Nova Vul 2007 (S. Nakano, IAUC 8861 ) with the Swift X-ray Telescope in a 6.7ks observation obtained on 2007 October 18 at UT 01:05. The XRT spectrum contains 192 X-ray photons and is largely consistent with a thermal plasma model with temperature kT=0.2 +0.4/-0.07 keV and absorbing column NH=(8 +2/-3)e21 cm^-2. A hotter component with a relative flux a factor of 10 lower and a temperature of kT>1 keV is also required for a statistically acceptable fit to the data. The 0.3-10 keV unabsorbed flux is 2.4e-12 erg cm^-2 s^-1, representing at least a ten-fold increase over an observation by the Swift XRT on 2007 August 9 in which the source was not detected.