Swift Observations of SN 2006dd in NGC 1316
ATel #841; S. Immler (Goddard Space Flight Center, NASA, and Universities Space Research Association), P. Milne (Steward Observatory, University of Arizona), and P. J. Brown (Pennsylvania State University), on behalf of the Swift-satellite team:
on 21 Jun 2006; 05:59 UT
Distributed as an Instant Email Notice Supernovae
Credential Certification: Stefan Immler (immler@milkyway.gsfc.nasa.gov)
Subjects: Optical, Ultra-Violet, X-ray, Supernovae
We report on Swift Ultraviolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT) observations of SN 2006dd (cf. CBET #533) obtained on June 20.71 UT.
We confirm the detection of a new object at R.A. = 03h22m41s.64, Decl. = -37o12'13".2 (equinox 2000.0) as compared to Digitized Sky Survey images, consistent with the position reported by Monard in CBET #553, with UVOT magnitudes of V = 14.0 (167 s exposure time), B = 14.5 (259 s), U = 13.7 (258 s), UVW1 [181-321 nm] = 15.5 (520 s), UVM2 [166-268 nm] = 17.9 (881 s), and UVW2 [112-264 nm] = 18.1 (881 s). Statistical and systematic errors are 0.1 mag each.
Comparison to the photometry obtained on June 20.158 (B = 14.66, V = 14.41; CBET #553) shows that the SN is still pre maximum. The B-V and U-B colors are similar to those of SN 2006bp (type II-P) before maximum (Immler & Brown, ATel #793). Furthermore, comparison of the colors with other supernovae from Poznanski et al. (2002, PASP 114, 833) indicates that 2006dd is a young type-II SN before or around maximum.
No X-ray source is detected at the position of the SN in a simultaneous 4.1 ks XRT observation. The 3-sigma upper limit to the XRT net count rate is 8.0 E-03 cts/s, corresponding to a (0.2-10 keV) X-ray flux and luminosity of <4.0 E-13 ergs/cm/cm/s and <2.9 E40 ergs/s, respectively, for an adopted thermal plasma spectrum with a temperature of kT=10 keV, a Galactic foreground column density of N_H = 1.89E+20 (Dickey & Lockman, 1990, ARAA. 28, p215) and a distance of 24.5 Mpc (z=0.00587, NED).
No further Swift observations are scheduled due to Sun angle constraints.
Swift finding chart
