Electronic Telegram No. 387
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
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CBAT@CFA.HARVARD.EDU (science)
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SUPERNOVA 2005ke IN NGC 1371
     S. Immler, Goddard Space Flight Center, NASA, and Universities
Space Research Association; P. Brown, Pennsylvania State University;
P. Milne, University of Arizona; D. Burrows, Pennsylvania State
University; and N. Gehrels, Goddard Space Flight Center, NASA; on
behalf of the Swift-satellite team, report on Swift X-Ray Telescope
(XRT) observations (energy range 0.2-10 keV) of the type-Ia supernova
2005ke (IAUC 8630, 8631), starting on Nov. 14.675 UT.
     An excess of x-ray counts is detected from the position of the
supernova (3- to 3.5-sigma level of significance, depending on the
location of the background-extraction regions) in the merged XRT
data ranging from 8 to 76 days after the explosion (Nov. 6 +/- 2).
The XRT count rate of (2.2 +/- 0.6) x 10**(-4) cts/s corresponds to a
0.3- to 2-keV flux and luminosity of (4 +/- 1) x 10**(-15) ergs/cm**2/s
and (2.0 +/- 0.5) x 10**38 ergs/s, respectively, for an adopted thermal
plasma spectrum with a temperature of kT = 10 keV and a distance of
20.7 Mpc.
     Using simultaneous Swift Ultraviolet/Optical Telescope (UVOT;
wavelength range 170-650 nm) observations, detection was made of an
excess of ultraviolet emission with respect to type-Ia-supernovae
lightcurve templates starting around 35 days after the explosion.
The x-ray and ultraviolet emission give evidence for interaction of
the supernova shock with circumstellar matter, likely deposited by the
companion's stellar wind with a mass-loss rate of 8 x 10**(-6) solar
masses per year.
     Further Swift observations are scheduled, and observations in other
wavelength regimes are encouraged.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2006 CBAT
2006 February 5                  (CBET 387)               Daniel W. E. Green