Swift Observations of IIn SN2013I/DES12S1a
ATel #4780; Peter J. Brown (Texas A&M, Mitchell Institute) and Stefan Immler (NASA/CRESST/GSFC)
on 3 Feb 2013; 02:55 UT
Credential Certification: Peter J. Brown (grbpeter@yahoo.com)
Subjects: Optical, Ultra-Violet, X-ray, Supernovae
The Ultraviolet/Optical Telescope (UVOT) on board the Swift satellite started observing the type IIn Supernova 2013I/DES12S1a near SDSS J024942.76+004535.4 (CBET #3386, ATEL #4741) at 2013-01-22 00:08:15 UT. The following UVOT magnitudes were measured: v = 18.60 +/- 0.14 (396 s exposure time), b = 19.42 +/- 0.15 (396 s), u = 18.96 +/- 0.15 (396 s), uvw1 [181-321nm] = 19.65 +/- 0.16 (1191 s), uvm2 [166-268nm] = 19.77 +/- 0.11 (3078 s), uvw2 [112-264 nm] = 19.97 +/- 0.13 (1987 s). These magnitudes are on the UVOT Vega photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) and have not been corrected for extinction.
No X-ray source is detected at the position of the SN in the 7.1 ks Swift XRT observation obtained simultaneously with the UVOT observations. The 3-sigma upper limit to the XRT net count rate is <1.0E-03 cts/s, corresponding to an unabsorbed (0.2-10 keV band) X-ray flux of <5.0E-14 erg/cm/cm/s and a luminosity of <1.2E41 erg/s for an adopted thermal plasma spectrum with a temperature of kT = 10 keV, a Galactic foreground column density of N_H = 5.2E20 (Dickey & Lockman, 1990, ARAA, 28, 215) and an assumed distance of 140 Mpc (NED).
