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Swift Observations of SN 2007af

ATEL # 1020; S. Immler (NASA/USRA/GSFC), P. J. Brown (PSU), and P. Milne (U of Arizona) on behalf of the Swift satellite team
on 3 Mar 2007; 17:06 UT
Password Certification: Stefan Immler (

Subjects: Optical, Ultra-Violet, X-ray, Nova, Supernova

Swift Ultraviolet/Optical Telescope (UVOT) and X-Ray Telescope (XRT) observed SN 2007af (CBET #863) on 2007-03-02.80 UT. The following UVOT magnitudes were measured: V = 15.0 (410 s exposure time), B = 15.1 (410 s), U = 15.4 (410 s), UVW1 [181-321nm] = 17.2 (820 s), UVM2 [166-268 nm] = 18.8 (1160 s), and UVW2 [112-264 nm] = 18.4 (1640 s). The magnitudes have not been corrected for extinction. Statistical and systematic errors are estimated to be 0.1 mag each.

The UV and optical colors are most similar to those of young type Ia SNe observed by Swift UVOT and well separated from young type II SNe.

No X-ray source is detected at the position of the SN in the 4.9 ks Swift XRT observation obtained simultaneously with the UVOT observations. The 3-sigma upper limit to the XRT net count rate is 4.0 E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV band) X-ray flux of <2.0 E-13 ergs/cm/cm/s and a luminosity of <1.3 E40 ergs/s for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of N_H = 3.09E+20 (Dickey & Lockman, 1990, ARAA 28) and a distance of 23.2 Mpc (z=0.005464, NED; H_o = 71 km/s/Mpc, Omega_M = 1/3, Omega_L = 2/3).

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