Swift observation of PSN J03220535-1523156
ATel #3909; R. Margutti, D. Milisavljevic, A. Soderberg (Harvard University)
on 2 Feb 2012; 19:33 UT
Credential Certification: Raffaella Margutti (rmargutti@cfa.harvard.edu)
Subjects: Optical, Ultra-Violet, X-ray, Supernovae
PSN J03220535-1523156 is a peculiar type Ia supernova that exploded in NGC 1309 (Cenko, Atel #3901, Atel #3900) at a distance of 28 Mpc (from NED). A Swift ToO was executed starting from 2012-02-02T04:33:51 UT.
Swift-UVOT observations have been obtained in the 6 optical/UV filters. The SN is clearly detected in all filters. Including possible contamination from the host galaxy, we measure the following preliminary magnitudes (UVOT photometric system Breeveld et al. 2011, arXiv:1102.4717): v=15.55 +/- 0.10; b=15.46 +/- 0.10; u=14.59 +/- 0.10; uvw1=15.76 +/- 0.10; uvm2=16.71 +/- 0.10; uvw2=16.87 +/- 0.10. Magnitudes are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.051 in the direction of the transient (Schlegel et al. 1998).
Contemporary Swift-XRT observations have been performed (total exposure of 5 ks). No X-ray source is detected at the optical position of the transient, with a 3 sigma upper limit of ~5 c/s in the 0.3-10 keV energy band. The Galactic neutral hydrogen column density in the direction of the event is 3.78d20 1/cm2 (Kalberla 2005). Assuming a spectral photon index ~2, this translates into an absorbed flux of ~2.5d-13 erg/s/cm2 (corresponding to a luminosity of 2d40 erg/s).
We thank the Swift team for scheduling these ToO observations.
