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Swift Observations of SN 2007S

ATel #988; S. Immler (NASA/USRA/GSFC), P. J. Brown (PSU), and P. Milne (U of Arizona) on behalf of the Swift satellite team
on 6 Feb 2007; 16:07 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) observed the type Ia SN 2007S (CBET #825, CBET #829) on 2007-02-05.63 UT, 2007-02-05.80 UT, and 2007-02-06.04 UT. The following UVOT magnitudes were measured for these three epochs: V = 15.7 (208 s exposure time), 15.6 (208 s), 15.5 (352 s), B = 16.1 (417 s), 16.1 (208 s), 16.1 (352 s), U = 15.9 (417 s), 15.9 (208 s), 15.9 (352 s), UVW1 [181-321nm] = 17.7 (836 s), 17.4 (417 s), 17.5 (697 s), UVM2 [166-268 nm] = 18.9 (597 s), 18.4 (598 s), 18.9 (830 s), and UVW2 [112-264 nm] = 18.6 (1404 s), 18.3 (835 s), 18.8 (141 s). The magnitudes have not been corrected for extinction. Due to possible contamination with the host galaxy, errors are estimated to be 0.3 mag each.

No X-ray source is detected at the position of the SN in the merged 5.3 ks Swift XRT observation obtained simultaneously with the UVOT observations. The 3-sigma upper limit to the XRT net count rate is 3.8 E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV band) X-ray flux of <1.9 E-13 ergs/cm/cm/s and a luminosity of <8.2E40 ergs/s for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of N_H = 2.56E+20 (Dickey & Lockman, 1990, ARAA 28) and a distance of 60 Mpc (z=0.013880, NED; H_o = 71 km/s/Mpc, Omega_M = 1/3, Omega_L = 2/3).