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ATEL # 1101; S. Immler (NASA/USRA/GSFC) on behalf of the Swift satellite team
on 10 Jun 2007; 17:24 UT
Password Certification: Stefan Immler (firstname.lastname@example.org)
Subjects: Optical, Ultra-Violet, X-ray, Nova, Supernova
Swift Ultraviolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT) observed the type Ia SN 2007co (CBET #977, CBET #978) on 2007-06-09.84 UT. The following UVOT magnitudes were measured: V = 17.0 (356 s exposure time), B = 17.1 (377 s), U = 17.1 (377 s), UVW1 [181-321nm] = 19.2 (1267 s), UVM2 [166-268 nm] > 20.5 (905 s), and UVW2 [112-264 nm] > 21.0 (1368 s). The magnitudes have not been corrected for extinction. Statistical and systematic errors are estimated to be 0.1 mag each.
No X-ray source is detected at the position of the SN in the merged 4.6 ks Swift XRT observation obtained simultaneously with the UVOT observation. The 3-sigma upper limit to the XRT net count rate is 1.9 E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV band) X-ray flux of < 1.1 E-13 erg/cm/cm/s and a luminosity of <1.8 E41 erg/s for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of N_H = 8.77E+20 (Dickey & Lockman, 1990, ARAA 28) and a distance of 116 Mpc (z=0.026962, NED; H_o = 71 km/s/Mpc, Omega_M = 1/3, Omega_L = 2/3).