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Swift Observations of SN 2007I

ATel #979; S. Immler (NASA/USRA/GSFC) and P. J. Brown (PSU) on behalf of the Swift satellite team
on 22 Jan 2007; 19:38 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 Ic SN 2007I (CBET #807, CBET #808) on 2007-01-20.03 UT (V and B bands) and 2007-01-20.08 UT (UVW1 band). The following UVOT magnitudes were measured: V = 17.9 (825 s exposure time), B = 19.2 (797 s), UVW1 [181-321nm] = 19.5 (7,719 s). The magnitudes have not been corrected for extinction. Due to the small offset from the center of the host galaxy (1.1"), similar to the spatial resolution of the UVOT instrument (1.9"), and possible contamination, errors are estimated to be 0.4 mag.

No X-ray source is detected at the position of the SN in the merged 9.4 ks Swift XRT observation obtained simultaneously. The 3-sigma upper limit to the XRT net count rate is 1.7 E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV band) X-ray flux of < 8.6 E-14 ergs/cm/cm/s and a luminosity of <8.9E40 ergs/s for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of N_H = 2.25E+20 (Dickey & Lockman, 1990, ARAA 28) and a distance of 93 Mpc (z=0.021639, NED; H_o = 71 km/s/Mpc, Omega_M = 1/3, Omega_L = 2/3).