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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.