Pre-nova X-ray observations of V2491 Cygni (Nova Cyg 2008b)

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Table 2:

Observation log of the *ROSAT*, *XMM-Newton* and *Swift* pre-nova observations. Apart from the exposure time the count rates in different energy bands as well as the absorbed fluxes are given (see text for more details).
Date	Days	Instrument	Exposure time	Count rate¹	Count rate	Count rate	0.2-10.0 keV flux²
	before		(ks)	(cts/ks)	(cts/ks)	(cts/ks)	(10^-12 erg cm^-2 s^-1)
	outburst				0.3-1.0 keV	1.0-8.0 keV	absorbed
1990-10-19	6383	ROSAT/PSPC[1RXS]	0.39	28 $\pm$ 11	--	--	$\rm 4.5^{+19.5}_{-1.8}$
1993-10-05	5302	ROSAT/PSPC[2RXP]	4.3	22 $\pm$ 3	12 $\pm$ 2	8 $\pm$ 2	0.3 $\pm$ 0.1
2006-11-15	517	XMM-Newton/EPIC	3.43 $\times$ 10^-3	$\rm 1173^{+613}_{-587}$	--	--	$\rm 2.5^{+7.0}_{-1.6}$
2007-05-25	322	Swift/XRT	1.06	21 $\pm$ 5	$\rm 1.9^{+1.9}_{-1.3}$	$\rm 20^{+5}_{-4}$	$\rm 5.5^{+8.5}_{-1.4}$
2007-06-10	306	Swift/XRT	0.97	41 $\pm$ 7	$\rm 11.8^{+4.2}_{-3.6}$	$\rm 31^{+7}_{-6}$	$\rm 10.7^{+16.5}_{-2.2}$
2007-07-17	269	Swift/XRT	3.82	23 $\pm$ 3	$\rm 3.5^{+1.3}_{-1.1}$	19 $\pm$ 3	1.0 $\pm$ 0.2
2007-07-21	265	Swift/XRT	4.87	$\rm 37^{+3}_{-4}$	27.9 $\pm$ 3.2	9 $\pm$ 2	0.8 $\pm$ 0.2
2008-01-02	100	Swift/XRT	5.65	24 $\pm$ 2	3.9 $\pm$ 1.0	20 $\pm$ 2	$\rm 1.6^{+0.5}_{-0.4}$

Note 1: energy bands: ROSAT/PSPC, 0.2-2.0 keV; XMM-Newton/EPIC, 0.2-12 keV; Swift/XRT, 0.3-10 keV.
Note 2: for the second ROSAT observation, the XMM-Newton and the first two Swift observations, the flux was calculated using a power-law with $\Gamma$ between 1.3 and 5.2, and $N_{\rm H}=2.2$ $\times$ 10²¹ cm^-2.

Source LaTeX | All tables | In the text

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