Swift Observations of Supernova 2006X in M100
ATel #726; Stefan Immler (NASA/USRA/GSFC)
on 9 Feb 2006; 07:30 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefan Immler (immler@milkyway.gsfc.nasa.gov)
Subjects: Optical, Ultra-Violet, X-ray, Supernovae
Referred to by ATel #: 751
S. Immler, Goddard Space Flight Center, NASA and Universities
Space Research Association, P. Brown, Pennsylvania State University,
and Peter Milne, U. of Arizona, on behalf of the Swift-satellite team,
report on Swift Ultraviolet/Optical Telescope (UVOT; wavelength range
170-650 nm) and X-Ray Telescope (XRT; 0.2-10 keV) observations of
the Type Ia SN 2006X (CBET #393) obtained on Feb 8.33 UT.
A new optical/UV source is detected at R.A. = 12h22m53s.92, Decl. = +15o48'31".2
(equinox 2000.0), when compared to Swift UVOT observations obtained
on Nov 13, 2005, consistent with the Lick Observatory position reported
in IAUC # 8667 . UVOT magnitudes are V = 15.7 mag (165 s exposure),
B = 17.2 mag (103 s), U = 18.0 mag (165 s), UVW1 [181-321 nm] = 18.2 mag
(332 s), UVM2 [166-268 nm] = 19.2 mag (506 s), and UVW2 [112-264 nm] >
20.4 mag (3-sigma upper limit; 674 s). Statistical and systematic errors
are 0.1 mag each.
No X-ray source is detected at the position of SN 2006X in a
simultaneous 2,124 s XRT X-ray observation. The 3-sigma upper limit to
the (0.2-10 keV band) count rate is 4.9E-03 cts/s, corresponding to an
X-ray flux and luminosity of <2.7E-13 ergs/cm/cm/s and <9.3E39 ergs/s,
respectively, for an assumed thermal plasma spectrum with a temperature
of 10 keV and an absorbing foreground column density of 2.39E+20 cm**-2
(Dickey & Lockman 1990, ARAA 28, 215). Further Swift observations are scheduled.
