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Detection of X-Ray Emission from SN 2005kd with Swift

ATel #981; S. Immler (NASA/USRA/GSFC), D. Pooley (UC Berkeley) and P. J. Brown (PSU) on behalf of the Swift satellite team
on 25 Jan 2007; 18:29 UT
Credential Certification: Stefan Immler (immler@milkyway.gsfc.nasa.gov)

Subjects: Optical, Ultra-Violet, X-ray, Supernovae

Swift Ultraviolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT) started observing the type IIn SN 2005kd (IAUC # 8630 ) on 2007-01-24.04 UT. The following UVOT magnitudes were measured: UVW1 [181-321nm] = 18.6 (2,422 s exposure time), UVM2 [166-268 nm] = 19.7 (2,994 s), and UVW2 [112-264 nm] = 19.7 (3,214 s). The magnitudes have not been corrected for extinction. Due to the location of the SN within a dense spiral arm, errors are estimated to be 0.4 mag.

An X-ray source is detected at a 5.7-sigma level of significance in the 8.9 ks XRT observation obtained simultaneously, consistent with the optical/UV position of the SN. The XRT net count rate is (4.5+/-0.8) E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV band) X-ray flux and luminosity of (2.9+/-0.5) E-13 ergs/cm/cm/s and (1.4+/-0.2) E41 ergs/s, respectively, for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of N_H = 1.49E+21 (Dickey & Lockman, 1990, ARAA 28) and a distance of 64.2 Mpc (z=0.015040, NED; H_o = 71 km/s/Mpc, Omega_M = 1/3, Omega_L = 2/3).

Observations in other wavelength regimes are encouraged.